---
id: CVE-2026-51882
title: >-
  The OpenAI-compatible file upload endpoint `/v1/files` in Langchain-Chatchat
  0.3.0 is vulnerable to path traversal
summary: >-
  The OpenAI-compatible file upload endpoint `/v1/files` in Langchain-Chatchat
  0.3.0 is vulnerable to path traversal. An attacker can write files to
  arbitrary locations outside the `openai_files` directory by crafting malicious
  filenames.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-22
published: '2026-10-01'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T15:17:22.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-51882'
references:
  - url: 'https://gist.github.com/Ro1ME/f80ac458836b59adb9c6ceff3993f7f3'
    label: cve@mitre.org
  - url: 'https://github.com/chatchat-space/Langchain-Chatchat/issues/5468'
    label: cve@mitre.org
  - url: 'https://gist.github.com/Ro1ME/f80ac458836b59adb9c6ceff3993f7f3'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/chatchat-space/Langchain-Chatchat/issues/5468'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-07T14:51:37.938402Z'
epss: 0.00509
epssPercentile: 0.43215
ingestedAt: '2026-10-01T23:03:32.775Z'
---

## Overview

The OpenAI-compatible file upload endpoint `/v1/files` in Langchain-Chatchat 0.3.0 is vulnerable to path traversal. An attacker can write files to arbitrary locations outside the `openai_files` directory by crafting malicious filenames.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.