What’s Vulnerable › Vulnerabilities

CVE-2026-81880: radare2: Uncontrolled resource consumption in radare2 PEF loader

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-22 · updated 2026-09-26
• Weakness: CWE-400

Description

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Apple Preferred Executable Format loader was vulnerable because the PEF loader accepted relocSecCount values that were not bounded by the number of sections or complete relocation records in the input. The vulnerability is triggered by normal binary-format auto-detection of a small crafted Apple PEF file. The loader could perform up to 268,435,456 relocation-section iterations and repeated buffer operations after record offsets passed the end of the file. This can cause denial of service through excessive CPU consumption and prolonged processing. This issue is fixed in version 6.2.0.

Affected products

• radareorg/radare2: before 6.2.0 — fixed in 6.2.0

How to fix

Upgrade to a fixed version: radareorg/radare2 6.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/radareorg/radare2/commit/87c780e29ee6251cebaab51585d14482cb7740ac
• https://github.com/radareorg/radare2/releases/tag/6.2.0
• https://github.com/radareorg/radare2/security/advisories/GHSA-fg6f-rj8g-25pq

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