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CVE-2026-51884.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSCRITICAL / 9.8CVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSDeferredModified Oct 05, 2026

Disclosure summary

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.

Source-reported weakness categories

CWE-22

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

NIST National Vulnerability Database · NVD-CVE-2026-51884

Open original source · Updated Oct 05, 2026

Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.

Original records & references

PUBLISHED 2026-10-01T18:17:03-04:00
MODIFIED 2026-10-05T15:17:21-04:00
INGESTED 2026-10-06T11:45:14-04:00