Vulnerability · Published Sep 22, 2026 · Assigned by GitHub_M
CVE-2026-81881radare2: Heap out-of-bounds read in radare2 Mach-O Swift metadata parser
Low 3.3
In plain English
A low-severity out-of-bounds read in radare2 from radareorg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:26.04:LTS | radare2 | no fix listed | UBUNTU-CVE-2026-81881 |
| Ubuntu:26.10 | radare2 | no fix listed | UBUNTU-CVE-2026-81881 |
Affected products (as reported)
Weakness: CWE-125, CWE-191 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
References
- https://github.com/radareorg/radare2/security/advisories/GHSA-q4w7-225g-64j9 x_refsource_CONFIRM
- https://github.com/radareorg/radare2/issues/26229 x_refsource_MISC
- https://github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74 x_refsource_MISC
- https://github.com/radareorg/radare2/releases/tag/6.2.0 x_refsource_MISC