{"id":"CVE-2026-117610","published":"2026-10-28T03:17:12.777","lastModified":"2026-10-28T03:17:12.777","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.","cvssScore":5.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-476"],"vendors":[],"products":[],"references":[{"url":"https://github.com/libexpat/libexpat","tags":[]},{"url":"https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L3468-L3510","tags":[]},{"url":"https://github.com/libexpat/libexpat/commit/7b0d50e4b1d16fafd55876260701e04279a7489d","tags":[]},{"url":"https://github.com/libexpat/libexpat/pull/1444","tags":[]},{"url":"https://www.vulncheck.com/advisories/libexpat-through-2.9.0-null-pointer-dereference-via-external-entity-subparser","tags":[]}],"exploitRefs":[{"url":"https://github.com/libexpat/libexpat","tags":[]},{"url":"https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L3468-L3510","tags":[]},{"url":"https://github.com/libexpat/libexpat/commit/7b0d50e4b1d16fafd55876260701e04279a7489d","tags":[]},{"url":"https://github.com/libexpat/libexpat/pull/1444","tags":[]}],"hasPoc":true,"ai":null}