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archive/Patch now/AIR-2026-0224
closedclosed 1 Oct 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-51884: Path traversal in Langchain Chatchat upload endpoint

Langchain Chatchat

A path traversal vulnerability in Langchain Chatchat's temporary document upload endpoint enables arbitrary file write via crafted filenames. The vulnerability carries a critical CVSS score.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
9.8
EPSS
0.01 · top 50% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
1 Oct 2026
last update
1 Oct 2026
CVE ids
CVE-2026-51884other records

Timeline · 1

  1. 1 Oct 2026CVE-2026-51884: The /knowledge_base/upload_temp_docs temporary document upload endpoint in Langchain Chatchat 0.3.1 is vulnerable to path…

Sources · 1

Advisories and databases

  1. 2026-10-01
    CVE-2026-51884: The /knowledge_base/upload_temp_docs temporary document upload endpoint in Langchain Chatchat 0.3.1 is vulnerable to path…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-51884

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Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
path-traversallangchain-chatchat
dates
happened 1 Oct 2026 · first reported 1 Oct 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 06:33Z · updated 2026-10-18 06:33Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-51884: Path traversal in Langchain Chatchat upload endpoint

https://gcdradar.vercel.app/incidents/cve-2026-51884-path-traversal-in-langchain-chatchat-upload-e · AIR-2026-0224 · closed 2026-10-01

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-10-01
- AI role: Attack on AI
- Products: Langchain Chatchat
- CVE ids: CVE-2026-51884
- CVSS: 9.8

## Summary

A path traversal vulnerability in Langchain Chatchat's temporary document upload endpoint enables arbitrary file write via crafted filenames. The vulnerability carries a critical CVSS score.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-10-01: CVE-2026-51884: The /knowledge_base/upload_temp_docs temporary document upload endpoint in Langchain Chatchat 0.3.1 is vulnerable to path… (https://nvd.nist.gov/vuln/detail/CVE-2026-51884)

## Sources

- 2026-10-01 NVD: CVE-2026-51884: The /knowledge_base/upload_temp_docs temporary document upload endpoint in Langchain Chatchat 0.3.1 is vulnerable to path… https://nvd.nist.gov/vuln/detail/CVE-2026-51884

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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