CVE-2026-81885: radare2 DoS — Exploit & Fix

Description

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's NE relocation fixup-chain parser was vulnerable because the NE relocation parser followed fixup chains without an active iteration limit or cycle detection. The vulnerability is triggered by opening a crafted NE executable whose in-bounds relocation entry points back to itself instead of reaching 0xffff. The parser repeatedly processed the same relocation and allocated another relocation object on each iteration. This can cause denial of service through continuous CPU and memory consumption. This issue is fixed in version 6.2.0.

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CVSS v3.1 Score

5.5

MEDIUM

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

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.02%

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-770 CWE-770

CWE-835 CWE-835

Affected Products

Vendor	Product	Versions
radare	radare2	< 6.2.0

References

Advisories & Patches

https://github.com/radareorg/radare2/commit/93d794caa7c2f08413106255d49546e544c1f9f0 https://github.com/radareorg/radare2/issues/26225 https://github.com/radareorg/radare2/pull/26192 https://github.com/radareorg/radare2/security/advisories/GHSA-43wr-4j49-rcxj https://github.com/radareorg/radare2/issues/26225

Exploits

https://github.com/radareorg/radare2/issues/26225 https://github.com/radareorg/radare2/issues/26225

Other References

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

Frequently Asked Questions

What is CVE-2026-81885? +

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's NE relocation fixup-chain parser was vulnerable because the NE relocation parser followed fixup chains without an active iteration limit or cycle detection. The vulnerability is triggered by opening a crafted NE executable whose in-bounds relocation entry points back to itself instead of reaching 0xffff. The parser repeatedly processed the same relocation and allocated another relocation object on each iteration. This can cause denial of service through continuous CPU and memory consumption. This issue is fixed in version 6.2.0. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-81885? +

CVE-2026-81885 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-81885? +

CVE-2026-81885 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-2026-81885? +

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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CVE-2026-81885