What is CVE-2026-32777?

CVE-2026-32777 is a medium-severity vulnerability in Libexpat Project, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 4.0/10. Published 2026-03-16.

How severe is CVE-2026-32777?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Vulnerability in Libexpat Project

CVE-2026-32777

libexpat before 2.7.5 allows an infinite loop while parsing DTD content.

Published 2026-03-16 · last modified 2026-07-14.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.002 (6.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000

Affected products

Libexpat Project — versions 0
Libexpat Project

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

github.com/libexpat/libexpat/pull/1159 (Patch, Issue Tracking)
github.com/libexpat/libexpat/issues/1161 (Exploit, Issue Tracking, Vendor Advisory)
github.com/libexpat/libexpat/pull/1162 (Patch, Issue Tracking)
issues.oss-fuzz.com/issues/486993411 (Permissions Required)
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

Frequently asked questions

What is CVE-2026-32777?: CVE-2026-32777 is a medium-severity vulnerability in Libexpat Project, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 4.0/10. Published 2026-03-16.
How severe is CVE-2026-32777?: Medium severity. CVSS v3 base score is 4.0 out of 10.