What is CVE-2026-56132?

CVE-2026-56132 is a medium-severity vulnerability in Libexpat Project, classified under CWE-821. CVSS score: 6.9/10. Published 2026-06-19.

How severe is CVE-2026-56132?

Medium severity. CVSS v3 base score is 6.9 out of 10.

Vulnerability in Libexpat Project

CVE-2026-56132

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

EPSS: 0.001 (1.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.9 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L.

Affected products

Libexpat Project — versions 0
Libexpat_project Libexpat

Weakness classification (CWE)

CWE-821

References

cve@mitre.org (Patch)

Frequently asked questions

What is CVE-2026-56132?: CVE-2026-56132 is a medium-severity vulnerability in Libexpat Project, classified under CWE-821. CVSS score: 6.9/10. Published 2026-06-19.
How severe is CVE-2026-56132?: Medium severity. CVSS v3 base score is 6.9 out of 10.