{"id":"CVE-2026-79534","aliases":["EUVD-2026-89359","GHSA-9c87-p3cg-99hj"],"status":"published","title":"mark3labs mcp-filesystem-server v0.11.1 is vulnerable to Directory Traversal due to an improper...","description":"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, 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.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00194,"percentile":0.09225,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22","CWE-59"],"published":"2026-09-29T00:00:00Z","modified":"2026-09-30T21:33:06Z","references":[{"url":"https://www.traceforce.ai/security-advisories/cve-2026-79534"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-79534"},{"url":"https://github.com/advisories/GHSA-9c87-p3cg-99hj"}],"sources":{"cve":[{"id":"CVE-2026-79534","description":"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, 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.","status":"published","published":"2026-09-29T00:00:00Z","modified":"2026-09-30T20:11:11.005Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-22","CWE-59"],"updated_at":"2026-11-02T13:50:27.582139Z"}],"euvd":[{"id":"EUVD-2026-89359","description":"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, 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.","status":"published","published":"2026-09-29T00:00:00Z","modified":"2026-09-30T20:11:11Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T17:27:47.293232Z"}],"ghsa":[{"id":"GHSA-9c87-p3cg-99hj","title":"mark3labs mcp-filesystem-server v0.11.1 is vulnerable to Directory Traversal due to an improper...","description":"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, 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.","status":"published","published":"2026-09-29T21:33:26Z","modified":"2026-09-30T21:33:06Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:12:39.341866Z"}],"nvd":[{"id":"CVE-2026-79534","description":"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, 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.","status":"published","published":"2026-09-29T20:17:26.993Z","modified":"2026-09-30T21:17:15.85Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-22","CWE-59"],"updated_at":"2026-11-02T14:12:52.759595Z"}]}}