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radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parse…

cve CVE-2026-81878 1 source, 1 claim · Watch

NVD writes:
radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial o… the claim
Severity
MEDIUM NVD
CVSS
5.5 NVD
Vendor
radareorg NVD
Product
radare2 NVD
CWE
CWE-190, CWE-787 NVD

How far exploitation has got

  1. No public code known
  2. Proof of concept
  3. Proof of concept, verified
  4. A Metasploit module
  5. Exploited in the wild
  6. Used in ransomware campaigns

Timeline

2026-09-22first spoke of it: radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0.NVD

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0.

What it is to other things

affectsradare/radare2
NVD
made_byradare
NVD

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

made_byradareorg
NVD says “radareorg”
affectsradareorg/radare2
NVD says “radareorg · radare2”
Every value, with what each source said and its receipt
PropertySourceSaidMeans here
Automatable
automatable
NVDno
At least one of those steps needs a person.
receipt
Source
NVD
Its words
no
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 UTCno
2026-09-29 09:45 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "radare2",
            "vendor": "radareorg",
            "versions": [
              {
                "status": "affected",
                "version": "< 6.2.0"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:radare:radare2:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "89E67591-1BCF-49F0-B047-71FCB5524CDB",
                "versionEndExcluding": "6.2.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0."
      }
    ],
    "id": "CVE-2026-81878",
    "lastModified": "2026-09-25T16:54:31.207",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6,
          "source": "security-advisories@github.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
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                "exploitation": "poc"
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              },
              {
                "technicalImpact": "partial"
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            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-22T17:54:59.836434Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-22T16:18:02.457",
    "references": [
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        "source": "security-advisories@github.com",
        "tags": [
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        "url": "https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0"
      },
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          "Mitigation",
          "Vendor Advisory"
        ],
        "url": "https://github.com/radareorg/radare2/issues/26222"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/radareorg/radare2/pull/26177"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/radareorg/radare2/releases/tag/6.2.0"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
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        "url": "https://github.com/radareorg/radare2/issues/26222"
      }
    ],
    "sourceIdentifier": "security-advisories@github.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-190"
          },
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
CVSS
cvss
NVD5.5
receipt
Source
NVD
Its words
5.5
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
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "radare2",
            "vendor": "radareorg",
            "versions": [
              {
                "status": "affected",
                "version": "< 6.2.0"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
    "configurations": [
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                "versionEndExcluding": "6.2.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
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      }
    ],
    "id": "CVE-2026-81878",
    "lastModified": "2026-09-25T16:54:31.207",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6,
          "source": "security-advisories@github.com",
          "type": "Secondary"
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      ],
      "ssvcV203": [
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              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-22T17:54:59.836434Z",
            "version": "2.0.3"
          }
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    "published": "2026-09-22T16:18:02.457",
    "references": [
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        ],
        "url": "https://github.com/radareorg/radare2/releases/tag/6.2.0"
      },
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        "source": "security-advisories@github.com",
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            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
CVSS vector
cvss_vector
NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
receipt
Source
NVD
Its words
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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 UTCCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
2026-09-29 09:45 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "radare2",
            "vendor": "radareorg",
            "versions": [
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      }
    ],
    "id": "CVE-2026-81878",
    "lastModified": "2026-09-25T16:54:31.207",
    "metrics": {
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      },
      {
        "source": "security-advisories@github.com",
        "tags": [
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    "vulnStatus": "Analyzed",
    "weaknesses": [
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            "lang": "en",
            "value": "CWE-190"
          },
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            "value": "CWE-787"
          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
CWE
cwe
NVDCWE-190, CWE-787
receipt
Source
NVD
Its words
CWE-190, CWE-787
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 UTCCWE-190, CWE-787
2026-09-29 09:45 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "radare2",
            "vendor": "radareorg",
            "versions": [
              {
                "status": "affected",
                "version": "< 6.2.0"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
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                "versionEndExcluding": "6.2.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
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      }
    ],
    "id": "CVE-2026-81878",
    "lastModified": "2026-09-25T16:54:31.207",
    "metrics": {
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        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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              },
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            "role": "CISA Coordinator",
            "timestamp": "2026-09-22T17:54:59.836434Z",
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      },
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        "url": "https://github.com/radareorg/radare2/pull/26177"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/radareorg/radare2/releases/tag/6.2.0"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://github.com/radareorg/radare2/security/advisories/GHSA-9phv-v2w8-56j3"
      },
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—
Exploitation
exploitation
NVDpoc
A public proof of concept exists, or exploitation is trivial.
receipt
Source
NVD
Its words
poc
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 UTCpoc
2026-09-29 09:45 UTC—
What the source handed over
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—
Product
product
NVDradare2
receipt
Source
NVD
Its words
radare2
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 UTCradare2
2026-09-29 09:45 UTC—
What the source handed over
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—
Severity
severity
NVDMEDIUM
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 UTCMEDIUM
2026-09-29 09:45 UTC—
What the source handed over
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medium
Status
status
NVDAnalyzed
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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}
—
Technical impact
technical_impact
NVDpartial
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 UTCpartial
2026-09-29 09:45 UTC—
What the source handed over
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        "value": "radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0."
      }
    ],
    "id": "CVE-2026-81878",
    "lastModified": "2026-09-25T16:54:31.207",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
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          "source": "security-advisories@github.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-81878",
            "options": [
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                "exploitation": "poc"
              },
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              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-22T17:54:59.836434Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-22T16:18:02.457",
    "references": [
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        "tags": [
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        "url": "https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0"
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      {
        "source": "security-advisories@github.com",
        "tags": [
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          "Vendor Advisory"
        ],
        "url": "https://github.com/radareorg/radare2/issues/26222"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch"
        ],
        "url": "https://github.com/radareorg/radare2/pull/26177"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/radareorg/radare2/releases/tag/6.2.0"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Patch",
          "Vendor Advisory"
        ],
        "url": "https://github.com/radareorg/radare2/security/advisories/GHSA-9phv-v2w8-56j3"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "Exploit",
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          "Vendor Advisory"
        ],
        "url": "https://github.com/radareorg/radare2/issues/26222"
      }
    ],
    "sourceIdentifier": "security-advisories@github.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-190"
          },
          {
            "lang": "en",
            "value": "CWE-787"
          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
Vendor
vendor
NVDradareorg
receipt
Source
NVD
Its words
radareorg
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 UTCradareorg
2026-09-29 09:45 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "radare2",
            "vendor": "radareorg",
            "versions": [
              {
                "status": "affected",
                "version": "< 6.2.0"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:radare:radare2:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "89E67591-1BCF-49F0-B047-71FCB5524CDB",
                "versionEndExcluding": "6.2.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0."
      }
    ],
    "id": "CVE-2026-81878",
    "lastModified": "2026-09-25T16:54:31.207",
    "metrics": {
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        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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          "impactScore": 3.6,
          "source": "security-advisories@github.com",
          "type": "Secondary"
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      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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              },
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      },
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        "source": "security-advisories@github.com",
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    "sourceIdentifier": "security-advisories@github.com",
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          },
          {
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            "value": "CWE-787"
          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
Every claim, by kind

vulnerability

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's CPython bytecode .pyc marshal parser was vulnerable because the CPython marshal readers accepted a 32-bit string length without rejecting values that overflow the size-plus-one allocation. The vulnerability is triggered by opening or inspecting a crafted .pyc file through r2 or rabin2. A length of 0xffffffff wrapped the allocation to zero before the common byte reader wrote attacker-controlled data and fill bytes beyond the heap allocation. This can cause heap memory corruption and denial of service; arbitrary code execution is possible but has not been demonstrated. This issue is fixed in version 6.2.0.
zetlyn/cve-nvd · 2026-09-22
automatable no cvss 5.5 cvss_vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H cwe CWE-190, CWE-787 exploitation poc product radare2 severity MEDIUM status Analyzed technical_impact partial vendor radareorg source