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.
History

Fri, 25 Sep 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Radare
Radare radare2
CPEs cpe:2.3:a:radare:radare2:*:*:*:*:*:*:*:*
Vendors & Products Radare
Radare radare2

Tue, 22 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 22 Sep 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Radareorg
Radareorg radare2
Vendors & Products Radareorg
Radareorg radare2

Tue, 22 Sep 2026 15:15:00 +0000

Type Values Removed Values Added
Description 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.
Title radare2: Integer overflow causes heap out-of-bounds write in radare2 PYC parser
Weaknesses CWE-190
CWE-787
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-22T15:07:45.225Z

Updated: 2026-09-22T17:55:51.200Z

Reserved: 2026-08-27T17:48:42.122Z

Link: CVE-2026-81878

cve-icon Vulnrichment

Updated: 2026-09-22T17:55:19.361Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-22T16:18:02.457

Modified: 2026-09-25T16:54:31.207

Link: CVE-2026-81878

cve-icon Redhat

No data.