CVE-2025-67366: Sylphx Filesystem Mcp

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

@sylphxltd/filesystem-mcp v0.5.8 is an MCP server that provides file content reading functionality. Version 0.5.8 of filesystem-mcp contains a critical path traversal vulnerability in its "read_content" tool. This vulnerability arises from improper symlink handling in the path validation mechanism: the resolvePath function checks path validity before resolving symlinks, while fs.readFile resolves symlinks automatically during file access. This allows attackers to bypass directory restrictions by leveraging symlinks within the allowed directory that point to external files, enabling unauthorized access to files outside the intended operational scope.

Affected products

• Sylphx Filesystem Mcp: version 0.5.8 only

Published 2026-01-07. Last modified 2026-09-16.