---
id: CVE-2026-51883
title: >-
  The knowledge base creation and document upload interfaces in
  Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal
summary: >-
  The knowledge base creation and document upload interfaces in
  Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker
  can inject path traversal sequences (such as `..\`) into the
  `knowledge_base_name` parameter to wri…
severity: none
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T22:17:03.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-51883'
references:
  - url: 'https://gist.github.com/Ro1ME/30f5139a2920bf7075299a33eb1690f2'
    label: cve@mitre.org
  - url: 'https://github.com/chatchat-space/Langchain-Chatchat/issues/5467'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-01T23:03:32.775Z'
---

## Overview

The knowledge base creation and document upload interfaces in Langchain-Chatchat 0.3.0;0.3.1 is vulnerable to path traversal. An attacker can inject path traversal sequences (such as `..\`) into the `knowledge_base_name` parameter to write knowledge base content to arbitrary locations outside the configured knowledge base root directory.

## Remediation

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