Security Advisory

CVE-2026-76641

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-20 17:31:10

Last updated 2026-08-21 11:21:12

Assigner VulnCheck

CVSS score 8.7

State PUBLISHED

Description

Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption by processing XML with external entity parsers created via XML_ExternalEntityParserCreate. A struct size mismatch between ELEMENT_TYPE members causes storeAtts to read the attIndex member past allocated memory boundaries, resulting in failure to normalize whitespace in non-CDATA attributes or a wild pointer dereference causing a segfault. This vulnerability was introduced by the fix for CVE-2026-66046.

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