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CVE-2026-81879

5.5 · MEDIUM

radare2 is a UNIX-like reverse engineering framework and command-line toolset.

Published Sep 22, 2026radareCWE-125EPSS 0.18%

Overview

CVE-2026-81879 is a medium-severity vulnerability affecting radare radare2. It was published on September 22, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from radare. Update radare2 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
radareradare2>= 0, < 6.2.0Affected

References

GitHubgithub.com/radareorg/radare2/commit/9449b07579c19b6b187c1a0918fbec2cef1a036eGitHubgithub.com/radareorg/radare2/issues/26223GitHubgithub.com/radareorg/radare2/pull/26178GitHubgithub.com/radareorg/radare2/releases/tag/6.2.0GitHubgithub.com/radareorg/radare2/security/advisories/GHSA-jqfq-hvcp-xh4pGitHubgithub.com/radareorg/radare2/issues/26223

How CyberStrike helps

Frequently asked questions

What is CVE-2026-81879?

CVE-2026-81879 is a medium-severity vulnerability affecting radare radare2. It was published on September 22, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-81879?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-81879?

Check the references section for vendor advisories and patches from radare. Update radare2 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-81879?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-81879 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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