What is CVE-2026-41080?

CVE-2026-41080 is a low-severity vulnerability in Libexpat Project, classified under Insufficient Entropy. CVSS score: 2.9/10. Published 2026-04-16.

How severe is CVE-2026-41080?

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

Vulnerability in Libexpat Project

CVE-2026-41080

libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.

Published 2026-04-16 · last modified 2026-07-14.

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.

EPSS exploit prediction

EPSS: 0.004 (31.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Libexpat Project — versions 0
Libexpat Project

Weakness classification (CWE)

CWE-331 — Insufficient Entropy

References

github.com/libexpat/libexpat/pull/1183 (Patch, Issue Tracking)
github.com/libexpat/libexpat/issues/47 (Issue Tracking)
www.openwall.com/lists/oss-security/2026/04/26/1 (Mailing List)
blog.hartwork.org/posts/expat-2-8-0-released/ (Release Notes)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

Frequently asked questions

What is CVE-2026-41080?: CVE-2026-41080 is a low-severity vulnerability in Libexpat Project, classified under Insufficient Entropy. CVSS score: 2.9/10. Published 2026-04-16.
How severe is CVE-2026-41080?: Low severity. CVSS v3 base score is 2.9 out of 10.