What is CVE-2026-45186?

CVE-2026-45186 is a low-severity vulnerability in Libexpat Project, classified under Inefficient Algorithmic Complexity. CVSS score: 2.9/10. Published 2026-05-10.

How severe is CVE-2026-45186?

Low severity. CVSS v3 base score is 2.9 out of 10.

Vulnerability in Libexpat Project

CVE-2026-45186

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

EPSS: 0.000 (1.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.9 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Libexpat Project — versions 0
Libexpat_project Libexpat

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity

References

cve@mitre.org (Exploit, Patch, Issue Tracking)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-45186?: CVE-2026-45186 is a low-severity vulnerability in Libexpat Project, classified under Inefficient Algorithmic Complexity. CVSS score: 2.9/10. Published 2026-05-10.
How severe is CVE-2026-45186?: Low severity. CVSS v3 base score is 2.9 out of 10.