CVE-2026-81883 radare2: Out-of-bounds Read at the end of string in the LUA 5.3 bytecode

What is CVE-2026-81883?

CVE-2026-81883 is a low-severity vulnerability in Radare Radare2, published on 22 Sep 2026.

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.

Weakness: CWE-125

Which versions are affected by CVE-2026-81883?

It affects 1 product.

Products include Radare Radare2.

How do I fix CVE-2026-81883?

Upgrade to a fixed version.

Is CVE-2026-81883 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81883 exists.

Other vulnerabilities in Radare Radare2

• CVE-2025-1864 Buffer Overflow and Potential Code Execution in Radare2 Critical 10.0
• CVE-2025-1744 Out-of-bounds Write in radare2 Critical 10.0
• CVE-2021-32494 Denial of service in radare2 Critical 10.0
• CVE-2021-32495 Use after free in radare2 Critical 10.0
• CVE-2024-29646 Memory corruption in n/a Critical 9.8

All Radare Radare2 vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-96m5-hvwp-674c, UBUNTU-CVE-2026-81883.