Vulnerability · Published Sep 22, 2026 · Assigned by GitHub_M
CVE-2026-81883radare2: Out-of-bounds Read at the end of string in the LUA 5.3 bytecode
Low 3.3
In plain English
A low-severity out-of-bounds read in radare2 from radareorg. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% 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 Lua 5.3 bytecode function parser was vulnerable because the Lua 5.3 bytecode function parser read fixed function-metadata fields immediately after a function-name string without checking the remaining buffer length. The vulnerability is triggered by opening or inspecting a crafted Lua 5.3 bytecode file whose function-name string ends at the input-buffer boundary. The parser read two integers and three one-byte fields beyond the allocated input buffer. This can cause invalid parser results 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-2026-81883 |
| Ubuntu:26.10 | radare2 | no fix listed | UBUNTU-CVE-2026-81883 |
Affected products (as reported)
Weakness: CWE-125 · 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-96m5-hvwp-674c x_refsource_CONFIRM
- https://github.com/radareorg/radare2/issues/26228 x_refsource_MISC
- https://github.com/radareorg/radare2/commit/26c2eac360033458e9d266e5e30667d1f8d642e3 x_refsource_MISC
- https://github.com/radareorg/radare2/releases/tag/6.2.0 x_refsource_MISC