{"schema":"threatline.record/2","record":{"id":"CVE-2026-51883","aliases":[],"summary":"The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker can inject path traversal sequences (such as `..\\`) into the `","details":"The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker can inject path traversal sequences (such as `..\\`) into the `knowledge_base_name` parameter to write knowledge base content to arbitrary locations outside the configured knowledge base root directory.","categories":["Unclassified"],"product":"n/a","vendor":"n/a","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-51883","source_modified_at":"2026-10-05T18:36:38.045Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"n/a","vendor":"n/a","versions":[{"version":"n/a","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":9.1,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00349,"percentile":0.27265,"score_date":"2026-10-23"},"published_at":"2026-10-01T00:00:00.000Z","modified_at":"2026-10-05T18:36:38.045Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-51883","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-05T18:36:38.045Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-51883","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/chatchat-space/Langchain-Chatchat/issues/5467","tags":["exploit"]},{"source":"CVE List","url":"https://gist.github.com/Ro1ME/30f5139a2920bf7075299a33eb1690f2"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-05T18:36:33.857980Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-05T18:36:38.045Z","content_hash":"74bacd5b60529fd210ca4830bf89cdd341821a0b22aac8988debfa73e9239387"}}