CVE-2026-24515

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.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.