Resource exhaustion in Radare Radare2
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (5.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · 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-43wr-4j49-rcxj (Patch, Vendor Advisory)
- github.com/radareorg/radare2/issues/26225 (Exploit, Mitigation, Issue Tracking, Vendor Advisory)
- github.com/radareorg/radare2/pull/26192 (Patch)
- github.com/radareorg/radare2/commit/93d794caa7c2f08413106255d49546e544c1f9f0 (Patch)
- github.com/radareorg/radare2/releases/tag/6.2.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-81885?
- CVE-2026-81885 is a medium-severity vulnerability in Radare Radare2, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.5/10. Published 2026-09-22.
- How severe is CVE-2026-81885?
- Medium severity. CVSS v3 base score is 5.5 out of 10.