---
id: CVE-2026-7846
aliases:
  - GHSA-x229-w2j4-h748
  - PYSEC-2026-2559
title: >-
  Langchain-Chatchat has a Race Condition in its OpenAI-Compatible File Upload
  API
summary: >-
  Langchain-Chatchat has a Race Condition in its OpenAI-Compatible File Upload
  API
severity: low
cvss: 2.6
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N'
vendor: langchain-chatchat
product: langchain-chatchat
ecosystem: pip
affected:
  - langchain-chatchat <= 0.3.1.3
published: '2026-05-05'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-x229-w2j4-h748'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-7846'
  - url: 'https://github.com/chatchat-space/Langchain-Chatchat/issues/5463'
  - url: >-
      https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-2-Silent-File-Overwrite.md
  - url: 'https://github.com/chatchat-space/Langchain-Chatchat'
  - url: 'https://vuldb.com/submit/807795'
  - url: 'https://vuldb.com/vuln/361125'
  - url: 'https://vuldb.com/vuln/361125/cti'
tags:
  - osv
  - pip
epss: 0.00162
epssPercentile: 0.05773
ingestedAt: '2026-07-13T18:58:04.805Z'
---

## Overview

A vulnerability has been found in chatchat-space Langchain-Chatchat up to 0.3.1.3. Impacted is the function files of the file libs/chatchat-server/chatchat/server/api_server/openai_routes.py of the component OpenAI-Compatible File Upload API. Such manipulation of the argument file.filename leads to time-of-check time-of-use. Access to the local network is required for this attack to succeed. The attack requires a high level of complexity. The exploitability is considered difficult. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

## Affected packages

- `langchain-chatchat <= 0.3.1.3`

## Remediation

Refer to the advisory for the patched release.