Vulnerability · Published Dec 29, 2025 · Assigned by mitre
CVE-2025-66866
Medium 5.5
In plain English
A medium-severity improper input validation in the binutils package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.3%top 75.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
An issue was discovered in function d_abi_tags in file cp-demangle.c in BinUtils 2.26 allows attackers to cause a denial of service via crafted PE file.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | binutils | no fix listed | DEBIAN-CVE-2025-66866 |
| Debian:13 | binutils | no fix listed | DEBIAN-CVE-2025-66866 |
| Debian:14 | binutils | no fix listed | DEBIAN-CVE-2025-66866 |
| Ubuntu:22.04:LTS | binutils | no fix listed | UBUNTU-CVE-2025-66866 |
| Ubuntu:24.04:LTS | binutils | no fix listed | UBUNTU-CVE-2025-66866 |
| Ubuntu:25.10 | binutils | no fix listed | UBUNTU-CVE-2025-66866 |
| Ubuntu:26.04:LTS | binutils | no fix listed | UBUNTU-CVE-2025-66866 |
| Ubuntu:26.10 | binutils | no fix listed | UBUNTU-CVE-2025-66866 |
Affected products (as reported)
Weakness: CWE-20 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H