CVE-2025-66866: gnu binutils Improper Input Validation
CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2025-66866DEBIAN-CVE-2025-66866
Published 29-12-2025Last modified 02-01-2026
Vulnerability summary
CVE-2025-66866 is a high (CVSS 7.5) Improper Input Validation vulnerability in gnu binutils. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.4% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.31%
0%100%
Low · -0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 29-12-2025PublishedVulnerability first disclosed.
- 02-01-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSources4 sources · 5.5–7.5
- CVE.orgCNA5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.31%
Chance of exploitation in the next 30 days
Percentile
22%
Versus all other CVEs
30-day change
-0.01 pp
From 0.32% on 18-09-2026
18-09-202618-10-2026
EPSS score0.31%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundCrgf Vul
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Debian1 product
- binutilsAll versions (No fix recorded)
Gnu1 product
- binutils2.26
Ubuntu1 product
- binutilsAll versions (No fix recorded)
3 vendors · 3 products
