org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification

cve CVE-2026-71290 2 sources, 2 claims · Watch

Red Hat writes:
org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification the claim

Severity they disagree: CRITICAL NVD
important Red Hat
CVSS they disagree: 9.1 NVD
8.1 Red Hat
Vendor: Apache Software Foundation NVD
Product: Apache HttpComponents Client NVD
CWE: CWE-295 NVD
CWE-295 Red Hat

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

Why the CVSS differs

Metric	NVD	Red Hat
Attack vector AV	network N	adjacent A
Attack complexity AC	low L	low L
Privileges required PR	none N	none N
User interaction UI	none N	none N
Scope S	unchanged U	unchanged U
Confidentiality C	high H	high H
Integrity I	high H	high H
Availability A	none N	none N

Each source scores the same vulnerability from what it judges the attack to need. The rows marked are where they judge it differently.

Timeline

2026-08-11	first spoke of it: Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. Please note the classic version of HttpClient is not affected by this vulnerability. Affected users are recommended to upgrade to at least version 5.6.4, which fixes the issue.	NVD
2026-08-11	first spoke of it: org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification	Red Hat

What it is to other things

affects	apache/httpclient NVD
made_by	apache NVD

In words only, so not counted until a person confirms one:

made_by	`apache_software_foundation` NVD says “Apache Software Foundation”
affects	`apache_software_foundation/apache_httpcomponents_client` NVD says “Apache Software Foundation · Apache HttpComponents Client”

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 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

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

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.client5:httpclient5",
            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "E0A77896-6021-44F0-9EA9-C79EECD7A7E8",
                "versionEndExcluding": "5.6.4",
                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.2,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-08-11T21:17:51.157",
    "references": [
      {
        "source": "security@apache.org",
        "tags": [
          "Mailing List",
          "Release Notes"
        ],
        "url": "https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq"
      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "tags": [
          "Mailing List",
          "Third Party Advisory"
        ],
        "url": "http://www.openwall.com/lists/oss-security/2026/08/13/6"
      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "description": [
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            "value": "CWE-295"
          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

NVD

9.1

receipt

Source: NVD
Its words: 9.1
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

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.client5:httpclient5",
            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
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                "versionEndExcluding": "5.6.4",
                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.2,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
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          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
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              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-08-11T21:17:51.157",
    "references": [
      {
        "source": "security@apache.org",
        "tags": [
          "Mailing List",
          "Release Notes"
        ],
        "url": "https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq"
      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "tags": [
          "Mailing List",
          "Third Party Advisory"
        ],
        "url": "http://www.openwall.com/lists/oss-security/2026/08/13/6"
      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
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          {
            "lang": "en",
            "value": "CWE-295"
          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

Red Hat

8.1

receipt

Source: Red Hat
Its words: 8.1
Read by: field:cvss3_score
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-71290",
  "CWE": "CWE-295",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2514394",
  "bugzilla_description": "org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification",
  "cvss3_score": "8.1",
  "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-08-11T20:33:56Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-71290.json",
  "severity": "important"
}

—

CVSS vector

cvss_vector

not compared

NVD

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

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

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

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.client5:httpclient5",
            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "E0A77896-6021-44F0-9EA9-C79EECD7A7E8",
                "versionEndExcluding": "5.6.4",
                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
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          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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              }
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            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
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          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS vector

cvss_vector

not compared

Red Hat

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

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Read by: field:cvss3_scoring_vector
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

2026-10-06 13:01 UTC	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
2026-09-29 09:44 UTC	—

What the source handed over

{
  "CVE": "CVE-2026-71290",
  "CWE": "CWE-295",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2514394",
  "bugzilla_description": "org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification",
  "cvss3_score": "8.1",
  "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-08-11T20:33:56Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-71290.json",
  "severity": "important"
}

—

CWE

cwe

NVD

CWE-295

receipt

Source: NVD
Its words: CWE-295
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	CWE-295
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.client5:httpclient5",
            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*",
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                "versionEndExcluding": "5.6.4",
                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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              },
              {
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              },
              {
                "technicalImpact": "total"
              }
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            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
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    "published": "2026-08-11T21:17:51.157",
    "references": [
      {
        "source": "security@apache.org",
        "tags": [
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          "Release Notes"
        ],
        "url": "https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq"
      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "tags": [
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          "Third Party Advisory"
        ],
        "url": "http://www.openwall.com/lists/oss-security/2026/08/13/6"
      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-295"
          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

CWE

cwe

Red Hat

CWE-295

receipt

Source: Red Hat
Its words: CWE-295
Read by: field:CWE
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-71290",
  "CWE": "CWE-295",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2514394",
  "bugzilla_description": "org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification",
  "cvss3_score": "8.1",
  "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-08-11T20:33:56Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-71290.json",
  "severity": "important"
}

—

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 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

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

What the source handed over

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            "vendor": "Apache Software Foundation",
            "versions": [
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                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
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                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
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            "integrityImpact": "HIGH",
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          },
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          "type": "Secondary"
        }
      ],
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        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
          }
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    },
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    "references": [
      {
        "source": "security@apache.org",
        "tags": [
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      },
      {
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          "Third Party Advisory"
        ],
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      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
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          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

Product

product

NVD

Apache HttpComponents Client

receipt

Source: NVD
Its words: Apache HttpComponents Client
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	Apache HttpComponents Client
2026-09-29 09:45 UTC	—

What the source handed over

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  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.client5:httpclient5",
            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
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                "versionEndExcluding": "5.6.4",
                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
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          "cvssData": {
            "attackComplexity": "LOW",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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          },
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          "impactScore": 5.2,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-08-11T21:17:51.157",
    "references": [
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      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "tags": [
          "Mailing List",
          "Third Party Advisory"
        ],
        "url": "http://www.openwall.com/lists/oss-security/2026/08/13/6"
      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
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      {
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          {
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          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

Severity

severity

conflict

NVD

CRITICAL

From the CVSS base score at 9.0 and above.

receipt

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

2026-10-06 12:29 UTC	CRITICAL
2026-09-29 09:45 UTC	—

What the source handed over

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  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.client5:httpclient5",
            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
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                "versionStartIncluding": "5.4",
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              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
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          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.2,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
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              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-08-11T21:17:51.157",
    "references": [
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      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "tags": [
          "Mailing List",
          "Third Party Advisory"
        ],
        "url": "http://www.openwall.com/lists/oss-security/2026/08/13/6"
      }
    ],
    "sourceIdentifier": "security@apache.org",
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        "type": "Secondary"
      }
    ]
  }
}

critical

Severity

severity

conflict

Red Hat

important

A flaw that can easily compromise confidentiality, integrity or availability.

receipt

Source: Red Hat
Its words: important
Read by: field:severity
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-71290",
  "CWE": "CWE-295",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2514394",
  "bugzilla_description": "org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification",
  "cvss3_score": "8.1",
  "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-08-11T20:33:56Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-71290.json",
  "severity": "important"
}

high

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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      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
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            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
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                "versionEndExcluding": "5.6.4",
                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.2,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
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              },
              {
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              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
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    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
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          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

total

The attacker gains full control of the component, or all of its information.

receipt

Source: NVD
Its words: total
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	total
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.client5:httpclient5",
            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
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                "versionEndExcluding": "5.6.4",
                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.2,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-71290",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-08-11T21:17:51.157",
    "references": [
      {
        "source": "security@apache.org",
        "tags": [
          "Mailing List",
          "Release Notes"
        ],
        "url": "https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq"
      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "tags": [
          "Mailing List",
          "Third Party Advisory"
        ],
        "url": "http://www.openwall.com/lists/oss-security/2026/08/13/6"
      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-295"
          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

Apache Software Foundation

receipt

Source: NVD
Its words: Apache Software Foundation
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	Apache Software Foundation
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "collectionURL": "https://repo.maven.apache.org/maven2/",
            "defaultStatus": "unaffected",
            "packageName": "org.apache.httpcomponents.client5:httpclient5",
            "product": "Apache HttpComponents Client",
            "vendor": "Apache Software Foundation",
            "versions": [
              {
                "lessThanOrEqual": "5.6.3",
                "status": "affected",
                "version": "5.4-alpha",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "security@apache.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "E0A77896-6021-44F0-9EA9-C79EECD7A7E8",
                "versionEndExcluding": "5.6.4",
                "versionStartIncluding": "5.4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. \n\n\nPlease note the classic version of HttpClient is not affected by this vulnerability. \n\nAffected users are recommended to upgrade to at least version 5.6.4, which fixes the issue."
      }
    ],
    "id": "CVE-2026-71290",
    "lastModified": "2026-09-24T04:17:48.873",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.2,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-71290",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-23T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-08-11T21:17:51.157",
    "references": [
      {
        "source": "security@apache.org",
        "tags": [
          "Mailing List",
          "Release Notes"
        ],
        "url": "https://lists.apache.org/thread/bhf7g2zwpom2ohvwjjjlonc93br2s8vq"
      },
      {
        "source": "af854a3a-2127-422b-91ae-364da2661108",
        "tags": [
          "Mailing List",
          "Third Party Advisory"
        ],
        "url": "http://www.openwall.com/lists/oss-security/2026/08/13/6"
      }
    ],
    "sourceIdentifier": "security@apache.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-295"
          }
        ],
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

org.apache.httpcomponents.client5/httpclient5: Apache HttpComponents Client: Server impersonation via improper TLS hostname verification zetlyn/cve-redhat · 2026-08-11	cvss 8.1 cvss_vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N cwe CWE-295 severity important	source
Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain. Please note the classic version of HttpClient is not affected by this vulnerability. Affected users are recommended to upgrade to at least version 5.6.4, which fixes the issue. zetlyn/cve-nvd · 2026-08-11	automatable yes cvss 9.1 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N cwe CWE-295 exploitation none product Apache HttpComponents Client severity CRITICAL status Analyzed technical_impact total vendor Apache Software Foundation	source