{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-51884", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-10-01T21:36:34.483Z", "dateReserved": "2026-06-08T00:00:00.000Z", "datePublished": "2026-10-01T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-10-01T21:36:34.483Z"}, "descriptions": [{"lang": "en", "value": "The /knowledge_base/upload_temp_docs temporary document upload endpoint in Langchain Chatchat 0.3.1 is vulnerable to path traversal. By crafting malicious filenames, an attacker can write files to arbitrary locations on the server, bypassing the intended restrictions on the temporary directory."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://github.com/chatchat-space/Langchain-Chatchat/issues/5466"}, {"url": "https://gist.github.com/Ro1ME/da028c9ce13dd888e265b9bef01d6eca"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}}, "dataVersion": "5.2"}

{}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The /knowledge_base/upload_temp_docs temporary document upload endpoint in Langchain Chatchat 0.3.1 is vulnerable to path traversal. By crafting malicious filenames, an attacker can write files to arbitrary locations on the server, bypassing the intended restrictions on the temporary directory."}], "id": "CVE-2026-51884", "lastModified": "2026-10-02T18:47:49.947", "metrics": {}, "published": "2026-10-01T22:17:03.257", "references": [{"source": "cve@mitre.org", "url": "https://gist.github.com/Ro1ME/da028c9ce13dd888e265b9bef01d6eca"}, {"source": "cve@mitre.org", "url": "https://github.com/chatchat-space/Langchain-Chatchat/issues/5466"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "0.3.1"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "langchain-chatchat", "vendor": "chatchat-space"}], "created": "2026-10-01T23:00:17.926851+00:00", "title": "Path Traversal Allowing Arbitrary File Write in Langchain Chatchat Temporary Upload Endpoint", "updated": "2026-10-01T23:15:16.128426+00:00", "vendors": ["chatchat-space", "chatchat-space$PRODUCT$langchain-chatchat"], "weaknesses": ["CWE-22"]}