{"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","slug":"CVE-2026-58166","body":"## Overview\n\nOpenBMB 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.\n\n## Affected\n\n- `ChatDev <= 2.2.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":62,"depthScoreParts":{"impact":50.1,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[]}