Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding…

cve CVE-2026-89044 1 source, 1 claim · Watch

NVD writes:
Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks. the claim

Severity: MEDIUM NVD
CVSS: 6.5 NVD
Fixed in: 4.1.138.Final, 4.2.18.Final NVD
Vendor: netty NVD
Product: netty NVD
CWE: CWE-444 NVD

How far exploitation has got

No public code known
Proof of concept
Proof of concept, verified
A Metasploit module
Exploited in the wild
Used in ransomware campaigns

Timeline

2026-09-10

first spoke of it: Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.

NVD

Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.

What it is to other things

affects	netty/netty NVD
made_by	netty NVD

Every value, with what each source said and its receipt

Property Source Said Means here

Automatable

automatable

NVD

yes

An attacker can reliably run all of the kill chain's first four steps without a person.

receipt

Source: NVD
Its words: yes
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	yes
2026-09-29 09:45 UTC	—

What the source handed over

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      }
    ]
  }
}

—

CVSS

cvss

NVD

6.5

receipt

Source: NVD
Its words: 6.5
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

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}

—

Cvss4

cvss4

NVD

6.9

receipt

Source: NVD
Its words: 6.9
Read by: field:cve.metrics.cvssMetricV40[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV40[].cvssData.baseScore
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	6.9
2026-09-29 09:45 UTC	—

What the source handed over

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            "modifiedPrivilegesRequired": "NOT_DEFINED",
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            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-89044",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T17:11:17.626681Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-10T18:18:16.243",
    "references": [
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Cvss4 vector

cvss4_vector

NVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

receipt

Source: NVD
Its words: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Read by: field:cve.metrics.cvssMetricV40[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV40[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
                "status": "affected",
                "version": "4.2.13.Final",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "D2ABD6AF-82BD-40D0-9A03-4101220F39CC",
                "versionEndExcluding": "4.1.138",
                "versionStartIncluding": "4.1.133",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "EC21FA2A-C386-4134-A447-92616A930370",
                "versionEndExcluding": "4.2.18",
                "versionStartIncluding": "4.2.13",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks."
      }
    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.5,
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-89044",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T17:11:17.626681Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-10T18:18:16.243",
    "references": [
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS vector

cvss_vector

NVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
                "status": "affected",
                "version": "4.2.13.Final",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "D2ABD6AF-82BD-40D0-9A03-4101220F39CC",
                "versionEndExcluding": "4.1.138",
                "versionStartIncluding": "4.1.133",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "EC21FA2A-C386-4134-A447-92616A930370",
                "versionEndExcluding": "4.2.18",
                "versionStartIncluding": "4.2.13",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks."
      }
    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.5,
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-89044",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T17:11:17.626681Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-10T18:18:16.243",
    "references": [
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

CWE

cwe

NVD

CWE-444

receipt

Source: NVD
Its words: CWE-444
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CWE-444
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
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                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
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                "version": "4.2.13.Final",
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              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
    "configurations": [
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      }
    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
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            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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      "cvssMetricV40": [
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            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
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      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Exploitation

exploitation

NVD

none

No evidence of exploitation, and no public proof of concept.

receipt

Source: NVD
Its words: none
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	none
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
                "status": "affected",
                "version": "4.2.13.Final",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
    "configurations": [
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                "versionEndExcluding": "4.1.138",
                "versionStartIncluding": "4.1.133",
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                "versionStartIncluding": "4.2.13",
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            "operator": "OR"
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      }
    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
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      "cvssMetricV40": [
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            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
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            "valueDensity": "NOT_DEFINED",
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        "tags": [
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      },
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      },
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      },
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        "tags": [
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      },
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        "tags": [
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    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Fixed in

fixed_in

NVD

4.1.138.Final, 4.2.18.Final

receipt

Source: NVD
Its words: 4.1.138.Final, 4.2.18.Final
Read by: field:cve.affected[].affectedData[].versions[status=affected].lessThan
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	4.1.138.Final, 4.2.18.Final
2026-09-29 09:45 UTC	—

What the source handed over

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    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
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                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
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                "versionEndExcluding": "4.1.138",
                "versionStartIncluding": "4.1.133",
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    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
    "metrics": {
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
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            "baseScore": 6.9,
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            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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            "vulnIntegrityImpact": "LOW",
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        ],
        "url": "https://github.com/netty/netty"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Product

product

NVD

netty

receipt

Source: NVD
Its words: netty
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	netty
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
                "status": "affected",
                "version": "4.2.13.Final",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
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              },
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            ],
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        ]
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    ],
    "cveTags": [],
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        "value": "Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks."
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    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
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      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "baseScore": 6.5,
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            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
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          },
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        }
      ],
      "cvssMetricV40": [
        {
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            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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                "technicalImpact": "partial"
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        "tags": [
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        ],
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      },
      {
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        "tags": [
          "Product"
        ],
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      },
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        ],
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      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
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        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Severity

severity

NVD

MEDIUM

From 4.0 to 6.9.

receipt

Source: NVD
Its words: MEDIUM
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	MEDIUM
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
                "status": "affected",
                "version": "4.2.13.Final",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
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              },
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                "vulnerable": true
              }
            ],
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          }
        ]
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    ],
    "cveTags": [],
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      {
        "lang": "en",
        "value": "Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks."
      }
    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
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            "attackVector": "NETWORK",
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            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
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          "type": "Secondary"
        }
      ],
      "cvssMetricV40": [
        {
          "cvssData": {
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            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
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            "baseSeverity": "MEDIUM",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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            "vulnAvailabilityImpact": "NONE",
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            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "disclosure@vulncheck.com",
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      ],
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        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "references": [
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        "tags": [
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      },
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        "source": "disclosure@vulncheck.com",
        "tags": [
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      },
      {
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      },
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        ],
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      },
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        "tags": [
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        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

medium

Status

status

NVD

Analyzed

receipt

Source: NVD
Its words: Analyzed
Read by: field:cve.vulnStatus
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

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  "cve": {
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      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
                "status": "affected",
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    "lastModified": "2026-09-18T18:17:39.213",
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            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-89044",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T17:11:17.626681Z",
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          }
        }
      ]
    },
    "published": "2026-09-10T18:18:16.243",
    "references": [
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

partial

The attacker gains limited control, or limited information.

receipt

Source: NVD
Its words: partial
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	partial
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
                "status": "affected",
                "version": "4.2.13.Final",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
    "configurations": [
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            "cpeMatch": [
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                "versionEndExcluding": "4.1.138",
                "versionStartIncluding": "4.1.133",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "EC21FA2A-C386-4134-A447-92616A930370",
                "versionEndExcluding": "4.2.18",
                "versionStartIncluding": "4.2.13",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks."
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    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.5,
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-89044",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T17:11:17.626681Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-10T18:18:16.243",
    "references": [
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

netty

receipt

Source: NVD
Its words: netty
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	netty
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
            "defaultStatus": "unaffected",
            "packageURL": "pkg:maven/io.netty/netty-codec-http",
            "product": "netty",
            "repo": "https://github.com/netty/netty",
            "vendor": "netty",
            "versions": [
              {
                "lessThan": "4.1.138.Final",
                "status": "affected",
                "version": "4.1.133.Final",
                "versionType": "custom"
              },
              {
                "lessThan": "4.2.18.Final",
                "status": "affected",
                "version": "4.2.13.Final",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
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                "matchCriteriaId": "D2ABD6AF-82BD-40D0-9A03-4101220F39CC",
                "versionEndExcluding": "4.1.138",
                "versionStartIncluding": "4.1.133",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "EC21FA2A-C386-4134-A447-92616A930370",
                "versionEndExcluding": "4.2.18",
                "versionStartIncluding": "4.2.13",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks."
      }
    ],
    "id": "CVE-2026-89044",
    "lastModified": "2026-09-18T18:17:39.213",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.5,
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-18T17:11:17.626681Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-10T18:18:16.243",
    "references": [
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Product"
        ],
        "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
      },
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Patch",
          "Third Party Advisory"
        ],
        "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

zetlyn/cve-nvd · 2026-09-10

automatable yes cvss 6.5 cvss4 6.9 cvss4_vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N cwe CWE-444 exploitation none fixed_in 4.1.138.Final, 4.2.18.Final product netty severity MEDIUM status Analyzed technical_impact partial vendor netty

source