OpenBMB ChatDev - Unauthenticated Path Traversal in Upload Handler Allows Arbitrary File Write and Delete

{
  "id": "98e6b02b935fb9c1a15c0f7048ed84a46abf0d977ed99e465bf262897f153677",
  "url": "https://osv.dev/vulnerability/CVE-2026-58166",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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 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.",
    "evidence": "osv:CVE-2026-58166",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-58166",
      "aliases": [
        "CVE-2026-58166"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openbmb/chatdev",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4fd4da603801766b14ad8788649cfc1ad21f99a6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4fd4da603801766b14ad8788649cfc1ad21f99a6"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.2.0",
            "v2.1.0",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58166.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.299854910Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58166.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-58166",
        "https://www.vulncheck.com/advisories/openbmb-chatdev-unauthenticated-path-traversal-in-upload-handler-allows-arbitrary-file-write-and-delete",
        "https://github.com/OpenBMB/ChatDev/pull/641",
        "https://github.com/OpenBMB/ChatDev/commit/4fd4da603801766b14ad8788649cfc1ad21f99a6",
        "https://github.com/OpenBMB/ChatDev",
        "https://github.com/OpenBMB/ChatDev/issues/638"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58166.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-58166",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520014,
  "published_at": "2026-06-30T15:51:20.9+00:00"
}