PT-2026-50832 · Libexpat · Libexpat

Published 2026-06-19 · Updated 2026-06-19 · CVE-2026-56132

Positive Technologies (AI Summary)

CVSS v3.1

6.9

Medium

Base vector

AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Name of the Vulnerable Software and Affected Versions libexpat versions prior to 2.8.2

Description A heap-based buffer overflow occurs in the doProlog() function within xmlparse.c. This issue arises because the reallocation of the scaffold backing array is mishandled when data-structure sharing is utilized across multiple parsers.

Recommendations Update to version 2.8.2 or later.

Fix

Weakness Enumeration

CWE-821

Related Identifiers

CVE-2026-56132

Affected Products

Libexpat

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-56132 · Security Note
• https://github.com/libexpat/libexpat/pull/1272 · Note
• https://twitter.com/VulmonFeeds/status/2067870709079040226 · Twitter Post