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…

PriorityP425medium5.5CVSS 3.1

AVLACLPRNUIRSUCNINAH

EPSS

0.20%

10.1th percentile

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

2 ranges

Vendor	Product	Version range	Fixed in
radare	radare2	< 6.2.0	6.2.0
radareorg	radare2	< 6.2.0	6.2.0

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