FKIE_CVE-2026-81878

Vulnerability from fkie_nvd - Published: 2026-09-22 16:18 - Updated: 2026-09-25 16:54
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0Patch
security-advisories@github.comhttps://github.com/radareorg/radare2/issues/26222Exploit, Mitigation, Vendor Advisory
security-advisories@github.comhttps://github.com/radareorg/radare2/pull/26177Patch
security-advisories@github.comhttps://github.com/radareorg/radare2/releases/tag/6.2.0Release Notes
security-advisories@github.comhttps://github.com/radareorg/radare2/security/advisories/GHSA-9phv-v2w8-56j3Patch, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/radareorg/radare2/issues/26222Exploit, Mitigation, Vendor Advisory
Impacted products
Vendor Product Version
radare radare2 *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "radare2",
          "vendor": "radareorg",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.2.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
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              "criteria": "cpe:2.3:a:radare:radare2:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "89E67591-1BCF-49F0-B047-71FCB5524CDB",
              "versionEndExcluding": "6.2.0",
              "vulnerable": true
            }
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          "negate": false,
          "operator": "OR"
        }
      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2\u0027s 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"
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        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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    "ssvcV203": [
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        "ssvcData": {
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          "options": [
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            {
              "automatable": "no"
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            {
              "technicalImpact": "partial"
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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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      "tags": [
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      "tags": [
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      "tags": [
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
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        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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