{"id":"CVE-2026-81878","title":"radare2 is a UNIX-like reverse engineering framework and command-line toolset","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 reje…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-190","CWE-787"],"vendor":"radareorg","product":"radare2","affected":["radare2 < 6.2.0"],"published":"2026-09-22","updated":"2026-09-23","sourceUpdated":"2026-09-23T18:28:25.093","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81878","references":[{"url":"https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0","label":"security-advisories@github.com"},{"url":"https://github.com/radareorg/radare2/issues/26222","label":"security-advisories@github.com"},{"url":"https://github.com/radareorg/radare2/pull/26177","label":"security-advisories@github.com"},{"url":"https://github.com/radareorg/radare2/releases/tag/6.2.0","label":"security-advisories@github.com"},{"url":"https://github.com/radareorg/radare2/security/advisories/GHSA-9phv-v2w8-56j3","label":"security-advisories@github.com"},{"url":"https://github.com/radareorg/radare2/issues/26222","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00183,"epssPercentile":0.08103,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T17:54:59.836434Z"},"ingestedAt":"2026-09-22T16:06:00.501Z","slug":"CVE-2026-81878","body":"## Overview\n\nradare2 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":209260,"id":"CVE-2026-81878","ts":1790100534676,"field":"exploit_available","old":"false","new":"true"}]}