{"id":"CVE-2026-117610","revision":"3e40120cea674701b2bae05fd7e1dbd7","records":[{"revision":"3e40120cea674701b2bae05fd7e1dbd7","observedAt":"2026-10-28T03:51:21.076+00:00","statement":{"source":"cve-program","id":"CVE-2026-117610","aliases":[],"title":"libexpat through 2.9.0 NULL Pointer Dereference via External Entity Subparser","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.","state":0,"publishedAt":"2026-10-28T02:03:18.766+00:00","modifiedAt":"2026-10-28T02:03:18.766+00:00","affected":[{"ecosystem":"Vendor product","name":"libexpat","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"libexpat\",\n                    \"product\": \"libexpat\",\n                    \"repo\": \"https://github.com/libexpat/libexpat\",\n                    \"packageURL\": \"pkg:github/libexpat/libexpat\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"2.9.0\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-117610","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-117610","identifiers":["CVE-2026-117610"]},"retained":false,"historicalAffected":[]}],"coverage":[]}