CVE-2026-81878

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.

• CWE-190
• CWE-787

• https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f91136461357c0Patch
• https://github.com/radareorg/radare2/issues/26222Exploit, Mitigation, Vendor Advisory
• https://github.com/radareorg/radare2/pull/26177Patch
• https://github.com/radareorg/radare2/releases/tag/6.2.0Release Notes
• https://github.com/radareorg/radare2/security/advisories/GHSA-9phv-v2w8-56j3Patch, Vendor Advisory
• https://github.com/radareorg/radare2/issues/26222Exploit, Mitigation, Vendor Advisory

Published

Sep 22, 2026

Last Modified

Sep 25, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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