Bug 2520649 (CVE-2026-76641) - CVE-2026-76641 expat: Expat: Denial of Service via XML external entity parsing
Summary: CVE-2026-76641 expat: Expat: Denial of Service via XML external entity parsing
Keywords:
Status: NEW
Alias: CVE-2026-76641
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2540058 2540060
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-20 17:57 UTC by OSIDB Bzimport
Modified: 2026-09-24 13:34 UTC (History)
20 users (show)

Fixed In Version:
Clone Of:
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Last Closed:
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Description OSIDB Bzimport 2026-08-20 17:57:06 UTC
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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