CVE-2026-117610
libexpat through 2.9.0 NULL Pointer Dereference via External Entity Subparser
libexpat libexpatLibraries & packages
CVSS
8.2HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
libexpat through 2.9.0 contains a NULL pointer dereference vulnerability in externalEntityInitProcessor2() in lib/xmlparse.c that mishandles the XML_TOK_NONE token from empty input. Attackers who control stream chunking can force an empty non-final first parse on an external entity subparser, causing a later parse to crash the application.
Text from CVE List
Affected versions 1
- libexpataffected: all versions through 2.9.0CVE List
References 5
- github.com/libexpat/libexpat/pull/1444Fixvia CVE List
- github.com/libexpat/libexpat/commit/7b0d50e4b1d16fafd55876260701e04279a7489dFixvia CVE List
- vulncheck.com/advisories/libexpat-through-2.9.0-null-pointer-dereference-via-external-entity-subparserAdvisoryvia CVE List
- github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L3468-L3510Referencevia CVE List
- github.com/libexpat/libexpatReferencevia CVE List