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Servers and applications

CVE-2026-117610

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.

Severity
High 8.2
Published
28 Oct 2026
Last changed
2 Nov 2026
Added to UpHeron
2 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
ExpatServers and applications · cpe:a:libexpat_project:libexpat
  • Every version up to 2.9.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-117610
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-117610