Bug 2432312 (CVE-2026-24515)

Summary: CVE-2026-24515 libexpat: libexpat null pointer dereference
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: adudiak, crizzo, gtanzill, jbuscemi, jmitchel, kshier, pbohmill, stcannon, teagle, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A null pointer dereference flaw has been discovered in libexpat. The function `XML_ExternalEntityParserCreate` failed to copy the encoding handler data passed to XML_SetUnknownEncodingHandler from the parent to the new subparser. This can cause a NULL dereference from external entities that declare use of an unknown encoding. The expected impact is denial of service. It takes use of both functions `XML_ExternalEntityParserCreate` and `XML_SetUnknownEncodingHandler` for an application to be vulnerable.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2433615, 2433619, 2433616, 2433618    
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Description OSIDB Bzimport 2026-01-23 08:01:14 UTC
In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data.