{"id":"CVE-2025-6855","aliases":["EUVD-2025-19478","GHSA-f823-phmg-x5fr","PYSEC-2026-1512"],"status":"published","title":"chatchat-space Langchain-Chatchat file path traversal","description":"A vulnerability, which was classified as critical, has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This issue affects some unknown processing of the file /v1/file. The manipulation of the argument flag leads to path traversal. The exploit has been disclosed to the public and may be used.","severity":{"version":"4.0","score":5.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00598,"percentile":0.48917,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22"],"published":"2025-06-29T09:00:15Z","modified":"2026-10-28T02:30:57Z","affected":[{"source":"ghsa","ecosystem":"PyPI","package":"langchain-chatchat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.3.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"langchain-chatchat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.3.1"}]}],"versions":["0.3.0","0.3.0.20240506","0.3.0.20240606","0.3.0.20240610","0.3.0.20240610.1","0.3.0.20240611","0.3.0.20240612","0.3.0.20240612.1","0.3.0.20240612.2","0.3.0.20240612.3","0.3.0.20240612.4","0.3.0.20240616","0.3.0.20240618","0.3.0.20240619","0.3.0.20240621","0.3.0.20240621.3","0.3.0.20240625","0.3.0.20240625.1","0.3.1"]},{"source":"osv","ecosystem":"PyPI","package":"langchain-chatchat","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.3.1"}]}],"versions":["0.3.0","0.3.0.20240506","0.3.0.20240606","0.3.0.20240610","0.3.0.20240610.1","0.3.0.20240611","0.3.0.20240612","0.3.0.20240612.1","0.3.0.20240612.2","0.3.0.20240612.3","0.3.0.20240612.4","0.3.0.20240616","0.3.0.20240618","0.3.0.20240619","0.3.0.20240621","0.3.0.20240621.3","0.3.0.20240625","0.3.0.20240625.1","0.3.1"]}],"products":[{"vendor":"chatchat-space","product":"langchain-chatchat"}],"references":[{"url":"https://vuldb.com/?id.314327","tags":["vdb-entry","technical-description","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://vuldb.com/?ctiid.314327","tags":["signature","permissions-required","Permissions Required","VDB Entry","report","web"]},{"url":"https://vuldb.com/?submit.601162","tags":["third-party-advisory","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://github.com/chatchat-space/Langchain-Chatchat/issues/5354","tags":["exploit","issue-tracking","Exploit","Issue Tracking","Vendor Advisory","report","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-6855","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-f823-phmg-x5fr","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/6xxx/CVE-2025-6855.json","tags":["advisory"]},{"url":"https://github.com/chatchat-space/Langchain-Chatchat","tags":["package"]},{"url":"https://pypi.org/project/langchain-chatchat","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-6855","title":"chatchat-space Langchain-Chatchat file path traversal","description":"A vulnerability, which was classified as critical, has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This issue affects some unknown processing of the file /v1/file. The manipulation of the argument flag leads to path traversal. 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