CVE-2026-81883: radare2 Out-of-bounds Read

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.

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CVSS v3.1 Score

3.3

LOW

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS — Exploit Prediction

0.0016

Probability of exploitation

0.04%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
radare	radare2	< 6.2.0

References

Advisories & Patches

https://github.com/radareorg/radare2/commit/26c2eac360033458e9d266e5e30667d1f8d642e3 https://github.com/radareorg/radare2/issues/26228 https://github.com/radareorg/radare2/security/advisories/GHSA-96m5-hvwp-674c https://github.com/radareorg/radare2/issues/26228

Exploits

https://github.com/radareorg/radare2/issues/26228 https://github.com/radareorg/radare2/issues/26228

Other References

https://github.com/radareorg/radare2/releases/tag/6.2.0

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 3.3 (LOW).

How severe is CVE-2026-81883? +

CVE-2026-81883 has a CVSS v3.1 score of 3.3 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0016, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-81883? +

CVE-2026-81883 affects products from radare, specifically: radare2. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-81883? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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