What’s Vulnerable › Vulnerabilities

CVE-2026-81881: radare2: Heap out-of-bounds read in radare2 Mach-O Swift metadata parser

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-22 · updated 2026-09-25
• Weakness: CWE-125

Description

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Mach-O Swift field-metadata parser was vulnerable because a relative Swift field pointer could be lower than the field-metadata section base, making subtraction produce a negative logical index. The vulnerability is triggered by parsing Swift type and class metadata from a crafted Mach-O file. The derived index was used to read four bytes immediately before the allocated field-metadata buffer. This can cause incorrect metadata processing or process termination; no attacker-observable memory disclosure has been demonstrated. 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/1da6e782df220edf56138ef5fe4f33745b04db74
• https://github.com/radareorg/radare2/issues/26229
• https://github.com/radareorg/radare2/releases/tag/6.2.0
• https://github.com/radareorg/radare2/security/advisories/GHSA-q4w7-225g-64j9

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