Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Radare | Radare2 | < 6.2.0 |
Related Weaknesses (CWE)
References
- https://github.com/radareorg/radare2/commit/6727454b666b28c33837b219a5f911364613Patch
- https://github.com/radareorg/radare2/issues/26222ExploitMitigationVendor 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-v2w8-56j3PatchVendor Advisory
- https://github.com/radareorg/radare2/issues/26222ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-81878?
CVE-2026-81878 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 accepte...
How severe is CVE-2026-81878?
CVE-2026-81878 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-81878?
Check the references section above for vendor advisories and patch information. Affected products include: Radare Radare2.