Resource exhaustion in Radare Radare2
CVE-2026-81880
radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Apple Preferred Executable Format loader was vulnerable because the PEF loader accepted relocSecCount values that were not bounded by the number of sections or complete relocation records in the input. The vulnerability is triggered by normal binary-format auto-detection of a small crafted Apple PEF file. The loader could perform up to 268,435,456 relocation-section iterations and repeated buffer operations after record offsets passed the end of the file. This can cause denial of service through excessive CPU consumption and prolonged processing. This issue is fixed in version 6.2.0.
Vulnerability class: DoS (Denial of Service)
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: 0.001 (3.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.3% 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: 0.001 · change: 0.000
Affected products
- Radare Radare2
- Radareorg Radare2 — versions < 6.2.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-81880?
- CVE-2026-81880 is a medium-severity vulnerability in Radare Radare2, classified under Uncontrolled Resource Consumption. CVSS score: 5.5/10. Published 2026-09-22.
- How severe is CVE-2026-81880?
- Medium severity. CVSS v3 base score is 5.5 out of 10.