{"schema":"threatline.record/2","record":{"id":"CVE-2026-118370","aliases":[],"summary":"libexpat through 2.9.0 Integer Overflow in storeAtts via attIndex and nPrefixes","details":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","categories":["Libraries & packages"],"product":"libexpat","vendor":"libexpat","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-118370","source_modified_at":"2026-10-28T02:03:19.447Z","fetched_at":"2026-10-28T08:18:35.509402Z","product":"libexpat","vendor":"libexpat","versions":[{"version":"0","status":"affected","versionType":"semver","lessThanOrEqual":"2.9.0"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":8.2,"severity":"High","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T02:03:19.447Z","modified_at":"2026-10-28T02:03:19.447Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-118370","fetched_at":"2026-10-28T08:18:35.509402Z","source_modified_at":"2026-10-28T02:03:19.447Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/libexpat/libexpat/pull/1450","tags":["patch","issue-tracking"]},{"source":"CVE List","url":"https://github.com/libexpat/libexpat/commit/1bac53c4fc460a03cd9860f39501c7979f6750ae","tags":["patch"]},{"source":"CVE List","url":"https://github.com/libexpat/libexpat/commit/621cb2c78b253ee023a86bc91d6ddb048481c04c","tags":["patch"]},{"source":"CVE List","url":"https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L4138-L4140","tags":["technical-description"]},{"source":"CVE List","url":"https://github.com/libexpat/libexpat","tags":["product"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/libexpat-through-2.9.0-integer-overflow-in-storeatts-via-attindex-and-nprefixes","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-28T02:03:19.447Z","content_hash":"248f57097d1c073932d2b986dc4ae8672b539d5d649c0f82b84d3b66c7872b66"}}