{"id":"CVE-2026-51883","aliases":["EUVD-2026-91122","GHSA-c4wm-cr62-pcg5"],"status":"published","title":"The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is...","description":"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.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00427,"percentile":0.37414,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22"],"published":"2026-10-01T00:00:00Z","modified":"2026-10-05T21:31:32Z","references":[{"url":"https://github.com/chatchat-space/Langchain-Chatchat/issues/5467","tags":["exploit"]},{"url":"https://gist.github.com/Ro1ME/30f5139a2920bf7075299a33eb1690f2"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-51883"},{"url":"https://github.com/advisories/GHSA-c4wm-cr62-pcg5"}],"sources":{"cve":[{"id":"CVE-2026-51883","description":"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.","status":"published","published":"2026-10-01T00:00:00Z","modified":"2026-10-05T18:36:38.045Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T13:39:50.160666Z"}],"euvd":[{"id":"EUVD-2026-91122","description":"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.","status":"published","published":"2026-10-01T00:00:00Z","modified":"2026-10-05T18:36:38Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T17:27:39.384414Z"}],"ghsa":[{"id":"GHSA-c4wm-cr62-pcg5","title":"The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is...","description":"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.","status":"published","published":"2026-10-02T00:31:30Z","modified":"2026-10-05T21:31:32Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:12:48.668129Z"}],"nvd":[{"id":"CVE-2026-51883","description":"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.","status":"published","published":"2026-10-01T22:17:03.127Z","modified":"2026-10-05T19:17:21.63Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:53.41762Z"}]}}