Medium severity5.9NVD Advisory· Published Oct 28, 2026
CVE-2026-117610
CVE-2026-117610
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.
Affected products
1- Range: <=2.9.0
Patches
Vulnerability mechanics
References
4- github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.cnvd
- github.com/libexpat/libexpat/commit/7b0d50e4b1d16fafd55876260701e04279a7489dnvd
- github.com/libexpat/libexpat/pull/1444nvd
- www.vulncheck.com/advisories/libexpat-through-2.9.0-null-pointer-dereference-via-external-entity-subparsernvd
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