The /knowledge_base/upload_temp_docs temporary document upload endpoint in Langchain…
Priority HIGH 82CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00621 50th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-51884
- 2026-10-03 Alias added: GHSA-c869-r44m-5f4w
- 2026-10-05 CVSS score added · CISA ADP
- 2026-10-05 Weakness changed · CISA ADP
- 2026-10-05 CISA SSVC decision points changed
- 2026-10-05 Priority changed: LOW → HIGH
- 2026-11-07 EPSS moved to the 50th–90th percentile
References
Sources
- CVE-2026-51884 · CVE Program
- CVE-2026-51884 · NVD
- FIRST EPSS
- GHSA-c869-r44m-5f4w · GitHub Advisory Database · CC BY 4.0
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