{"id":"CVE-2026-117610","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-117610","summary":"libexpat through 2.9.0 NULL Pointer Dereference via External Entity Subparser","details":"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.","published":"2026-10-28T02:03:18.766Z","modified":"2026-10-30T07:04:21.020656863Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/libexpat/libexpat/commit/7b0d50e4b1d16fafd55876260701e04279a7489d","label":"libexpat/libexpat@7b0d50e"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/117xxx/CVE-2026-117610.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117610"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/libexpat-through-2.9.0-null-pointer-dereference-via-external-entity-subparser"},{"type":"FIX","url":"https://github.com/libexpat/libexpat/commit/7b0d50e4b1d16fafd55876260701e04279a7489d"},{"type":"FIX","url":"https://github.com/libexpat/libexpat/pull/1444"},{"type":"PACKAGE","url":"https://github.com/libexpat/libexpat"},{"type":"ARTICLE","url":"https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L3468-L3510"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-30T07:04:21.020656863Z"}}