{"id":"CVE-2026-79534","title":"mark3labs mcp-filesystem-server v0.11.1 is vulnerable to Directory Traversal due to an improper link resolution in validatePath (filesystemserver/handler/helper.go)","summary":"mark3labs mcp-filesystem-server v0.11.1 is vulnerable to Directory Traversal due to an improper link resolution in validatePath (filesystemserver/handler/helper.go). When filepath.EvalSymlinks returns os.IsNotExist for a dangling symlink…","severity":"none","published":"2026-09-29","updated":"2026-09-29","sourceUpdated":"2026-09-29T20:17:26.993","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-79534","references":[{"url":"https://www.traceforce.ai/security-advisories/cve-2026-79534","label":"cve@mitre.org"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-29T19:44:04.153Z","slug":"CVE-2026-79534","body":"## Overview\n\nmark3labs mcp-filesystem-server v0.11.1 is vulnerable to Directory Traversal due to an improper link resolution in validatePath (filesystemserver/handler/helper.go). When filepath.EvalSymlinks returns os.IsNotExist for a dangling symlink, the fallback validates only the parent directory and returns the unresolved path, so write_file (and modify_file, copy_file, move_file, create_directory) follows a pre-existing dangling symlink located inside an allowed directory and creates a file outside the configured allowed directories.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}