{"schema":"threatline.record/2","record":{"id":"CVE-2026-77214","aliases":[],"summary":"libexpat Heap Buffer Over-read in xmlparse.c via XML_ParseBuffer","details":"libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching this path requires a parse buffer to already be present; otherwise XML_ParseBuffer returns XML_ERROR_NO_BUFFER. A buffer is present after a prior call to XML_GetBuffer, either directly (the common case) or indirectly through a prior XML_Parse call that allocates the buffer internally. The over-read discloses adjacent heap memory to the calling application, recovering heap pointers, libc function pointers, and code pointers sufficient to defeat ASLR and build further exploitation primitives.","categories":["Libraries & packages"],"product":"libexpat","vendor":"libexpat","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-77214","source_modified_at":"2026-10-10T02:26:09.470Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"libexpat","vendor":"libexpat","versions":[{"status":"affected","version":"0","versionType":"semver","lessThanOrEqual":"2.8.5"},{"status":"unaffected","version":"13c5f63a7f1c52c2feee3b16a1134d4fb68e9ea0","versionType":"git"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":8.3,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00549,"percentile":0.45207,"score_date":"2026-10-23"},"published_at":"2026-10-07T14:35:42.794Z","modified_at":"2026-10-10T02:26:09.470Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-77214","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-10T02:26:09.470Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-77214","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/libexpat/libexpat/pull/1393","tags":["issue-tracking"]},{"source":"CVE List","url":"https://github.com/libexpat/libexpat/commit/13c5f63a7f1c52c2feee3b16a1134d4fb68e9ea0","tags":["patch"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/libexpat-heap-buffer-over-read-in-xmlparse-c-via-xml-parsebuffer","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-10T02:25:58.906885Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-10T02:26:09.470Z","content_hash":"3a5b3f6121b0dc92494b87666a3744d9b4bb8003e1d5b4a58871ee420a296fe0"}}