CVE-2026-117610EUVD-2026-111545GHSA-V4H5-6R69-76P3
libexpat through 2.9.0 NULL Pointer Dereference via External Entity Subparser
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fix or patch referenced
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The Expat XML parsing library (libexpat), through version 2.9.0, is affected, so applications that use it to parse XML can be impacted. An attacker who controls how input data is split into chunks can crash the application by triggering a NULL pointer dereference, causing a denial of service.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- libexpat libexpat
through 2.9.0