CVE-2026-81878
mediumradare2 is a UNIX-like reverse engineering framework and command-line toolset.
Vendor / product: Radare — radare2
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.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0 security-advisories@github.com
- https://github.com/radareorg/radare2/issues/26222 security-advisories@github.com
- https://github.com/radareorg/radare2/pull/26177 security-advisories@github.com
- https://github.com/radareorg/radare2/releases/tag/6.2.0 security-advisories@github.com
- https://github.com/radareorg/radare2/security/advisories/GHSA-9phv-v2w8-56j3 security-advisories@github.com
- https://github.com/radareorg/radare2/issues/26222 134c704f-9b21-4f2e-91b3-4a467353bcc0