---
id: CVE-2026-58166
title: >-
  OpenBMB ChatDev - Unauthenticated Path Traversal in Upload Handler Allows
  Arbitrary File Write and Delete
summary: >-
  OpenBMB ChatDev through 2.2.0, fixed in commit 4fd4da6, contains a path
  traversal vulnerability that allows unauthenticated remote attackers to write
  or delete arbitrary files by supplying a malicious multipart filename in the
  file uploa…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-22
vendor: OpenBMB
product: ChatDev
affected:
  - ChatDev <= 2.2.0
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-07-01T15:00:34.716754Z'
exploitAvailable: true
published: '2026-06-30'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:06:48.638Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-58166'
references:
  - url: 'https://github.com/OpenBMB/ChatDev/issues/638'
    label: Researcher Disclosure
  - url: 'https://github.com/OpenBMB/ChatDev/pull/641'
    label: Fix PR
  - url: >-
      https://github.com/OpenBMB/ChatDev/commit/4fd4da603801766b14ad8788649cfc1ad21f99a6
    label: Fix Commit
  - url: >-
      https://www.vulncheck.com/advisories/openbmb-chatdev-unauthenticated-path-traversal-in-upload-handler-allows-arbitrary-file-write-and-delete
tags:
  - cve.org
  - exploit-available
epss: 0.00854
epssPercentile: 0.58542
ingestedAt: '2026-11-08T14:51:22.309Z'
---

## Overview

OpenBMB ChatDev through 2.2.0, fixed in commit 4fd4da6, contains a path traversal vulnerability that allows unauthenticated remote attackers to write or delete arbitrary files by supplying a malicious multipart filename in the file upload endpoint. Attackers can send a crafted filename containing path traversal sequences or an absolute path to the POST uploads session endpoint, which constructs the destination path without sanitization in save_upload_file, causing file write and cleanup operations to target attacker-chosen paths on the server filesystem.

## Affected

- `ChatDev <= 2.2.0`

## Remediation

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