Out-of-bounds Read in Radare Radare2
CVE-2026-81883
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (4.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Radare Radare2
- Radareorg Radare2 — versions < 6.2.0
Weakness classification (CWE)
References
- github.com/radareorg/radare2/security/advisories/GHSA-96m5-hvwp-674c (Patch, Vendor Advisory)
- github.com/radareorg/radare2/issues/26228 (Exploit, Mitigation, Issue Tracking, Vendor Advisory)
- github.com/radareorg/radare2/commit/26c2eac360033458e9d266e5e30667d1f8d642e3 (Patch)
- github.com/radareorg/radare2/releases/tag/6.2.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-81883?
- CVE-2026-81883 is a low-severity vulnerability in Radare Radare2, classified under Out-of-bounds Read. CVSS score: 3.3/10. Published 2026-09-22.
- How severe is CVE-2026-81883?
- Low severity. CVSS v3 base score is 3.3 out of 10.