{"schema_version":"1","data":[{"id":3189,"advisory_id":"2c5017e2-5c72-424e-9977-9f7c678b285b","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93990","source_published_at":"2026-09-19T22:58:11.224+00:00","published_at":"2026-10-24T21:31:10.393882+00:00","extraction_method":"structured","technologies":["core-cve","libexpat"],"cve_ids":["CVE-2026-93990"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"Expat before 2.8.5 Malformed UTF-16 Acceptance via Unchecked Surrogate","summary":"Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.","evidence":"cve:CVE-2026-93990","products":[{"name":{"value":"libexpat","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"high","structured":{"id":"CVE-2026-93990","aliases":["CVE-2026-93990"],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","baseScore":8.7,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","userInteraction":"NONE","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","subIntegrityImpact":"NONE","vulnIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","vulnConfidentialityImpact":"NONE"}},{"format":"CVSS","cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"NONE"}}],"affected":[{"repo":"https://github.com/libexpat/libexpat","vendor":"libexpat","product":"libexpat","versions":[{"status":"affected","version":"0","lessThan":"2.8.5","versionType":"semver"},{"status":"unaffected","version":"2.8.5","versionType":"semver"}],"packageURL":"pkg:github/libexpat/libexpat","defaultStatus":"unaffected"}],"modified":"2026-09-28T16:11:06.770Z","provider":"cve","references":["https://github.com/libexpat/libexpat/pull/1282","https://github.com/libexpat/libexpat/commit/ff6e1d7e750bbe245178f51a47a965dc8342861a","https://github.com/libexpat/libexpat/releases/tag/R_2_8_5","https://blog.hartwork.org/posts/expat-2-8-5-released/","https://github.com/libexpat/libexpat","https://www.vulncheck.com/advisories/expat-through-2.8.4-malformed-utf-16-acceptance-via-unchecked-surrogate"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-93990","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-21T15:10:43.564847Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-21T15:13:37.622Z"}}],"cna":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-28T16:11:06.770Z"}}},"related_cves":[{"value":"CVE-2026-93990","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"priority":{"reasons":["publisher_severity"],"severity":"high","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"high"},"context_update":false}],"next_after":3189,"next_before":3189}