CVE-2025-67364

The record

fast-filesystem-mcp version 3.4.0 contains a critical path traversal vulnerability in its file operation tools including fast_read_file. This vulnerability arises from improper path validation that fails to resolve symbolic links to their actual physical paths. The safePath and isPathAllowed functions use path.resolve() which does not handle symlinks, allowing attackers to bypass directory access restrictions by creating symlinks within allowed directories that point to restricted system paths. When these symlinks are accessed through valid path references, the validation checks are circumvented, enabling access to unauthorized files.

Affected packages

Related vulnerabilities

• GHSA-j893-m93w-jwjw fast-filesystem-mcp has a Path Traversal vulnerability Same vulnerability
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• CVE-2026-5327 A security flaw has been discovered in efforthye fast-filesystem-mcp up to 3.5.1. Also affects fast-filesystem-mcp
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