CVE-2026-81878: Radare RADARE2

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Radare RADARE2: before 6.2.0 (fixed in 6.2.0)

Published 2026-09-22. Last modified 2026-09-25.