{"id":"CVE-2026-117610","aliases":[],"title":"libexpat through 2.9.0 NULL Pointer Dereference via External Entity Subparser","titleSource":"VulnCheck","descriptionSource":"VulnCheck","products":[{"vendor":"libexpat","name":"libexpat","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.9.0","versionType":"semver"}],"defaultStatus":"unaffected","source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-117610"}],"remediation":[],"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.","severity":"high","score":8.2,"published":"2026-10-28T02:03:18.766Z","modified":"2026-10-28T02:03:18.766Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/libexpat/libexpat/pull/1444","https://github.com/libexpat/libexpat/commit/7b0d50e4b1d16fafd55876260701e04279a7489d","https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L3468-L3510","https://github.com/libexpat/libexpat","https://www.vulncheck.com/advisories/libexpat-through-2.9.0-null-pointer-dereference-via-external-entity-subparser"],"sources":[{"name":"CVE","id":"CVE-2026-117610","modified":"2026-10-28T02:03:18.766Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-117610"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.2},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T20:10:32.935Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}