Vulnerability Description
radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's ELF PN_XNUM handling was vulnerable because the ELF parser allocated the program-header array using the resolved PN_XNUM count but several consumers still iterated with the original e_phnum value of 65535. The vulnerability is triggered by processing a crafted ELF file with e_phnum = 0xffff and a much smaller resolved count in shdr[0].sh_info. Consumers iterated beyond the allocated program-header array. This can cause a heap out-of-bounds read and process termination, resulting in denial of service; memory disclosure and code execution have 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/9449b07579c19b6b187c1a0918fbec2cef1aPatch
- https://github.com/radareorg/radare2/issues/26223ExploitIssue TrackingMitigation
- https://github.com/radareorg/radare2/pull/26178Patch
- https://github.com/radareorg/radare2/releases/tag/6.2.0Release Notes
- https://github.com/radareorg/radare2/security/advisories/GHSA-jqfq-hvcp-xh4pPatchVendor Advisory
- https://github.com/radareorg/radare2/issues/26223ExploitIssue TrackingMitigation
FAQ
What is CVE-2026-81879?
CVE-2026-81879 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 ELF PN_XNUM handling was vulnerable because the ELF parser allocated the program-header array u...
How severe is CVE-2026-81879?
CVE-2026-81879 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-2026-81879?
Check the references section above for vendor advisories and patch information. Affected products include: Radare Radare2.