What is CVE-2025-66861?

CVE-2025-66861 is a low-severity vulnerability in GNU Binutils, classified under Uncontrolled Resource Consumption. CVSS score: 2.5/10. Published 2025-12-29.

How severe is CVE-2025-66861?

Low severity. CVSS v3 base score is 2.5 out of 10.

Resource exhaustion in GNU Binutils

CVE-2025-66861

An issue was discovered in function d_unqualified_name in file cp-demangle.c in BinUtils 2.26 allowing attackers to cause a denial of service via crafted PE file.

Vulnerability class: DoS (Denial of Service)

Published 2025-12-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.001 (3.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.2% 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

GNU Binutils — versions 2.26

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/caozhzh/CRGF-Vul/blob/main/cxxfilt/crash1.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-66861?: CVE-2025-66861 is a low-severity vulnerability in GNU Binutils, classified under Uncontrolled Resource Consumption. CVSS score: 2.5/10. Published 2025-12-29.
How severe is CVE-2025-66861?: Low severity. CVSS v3 base score is 2.5 out of 10.