{"id":"CVE-2026-79534","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-79534","generatedAt":"2026-10-28T00:53:05.060Z","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).","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.","published":"2026-09-29T20:17:27.000Z","lastModified":"2026-09-30T21:17:16.000Z","status":"Deferred","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N"},"cwe":["CWE-22","CWE-59"],"affected":[],"epss":{"score":0.00194,"percentile":0.09022,"date":"2026-10-26","history":[{"date":"2026-09-30","score":0.00213,"percentile":0.10447}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-09-30T23:15:17.000Z","detail":{"from":null,"score":"5.9","severity":"MEDIUM","fromSeverity":null},"summary":"Now scored CVSS 5.9 MEDIUM."},{"kind":"new","label":"New CVE","at":"2026-09-29T20:17:27.000Z","detail":{"score":null,"severity":null,"publishedAt":"2026-09-29T20:17:26.993Z"},"summary":"New CVE, medium severity (CVSS 5.9)."}],"references":[{"url":"https://www.traceforce.ai/security-advisories/cve-2026-79534","source":"cve@mitre.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-79534","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}