Wednesday, 28 October 2026
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CVE-2025-67366: Path traversal via symlinks in @sylphxltd/filesystem-mcp v0.5.8

Version 0.5.8 of the @sylphxltd/filesystem-mcp MCP server contains a path traversal vulnerability in its read_content tool, where path validation occurs before symlink resolution. Attackers can use symlinks inside an allowed directory to read files outside the intended scope.

Disclosed 7 January 2026 · Record updated 1 October 2026

Impact

Unauthorised read access to files outside the MCP server's permitted directories, bypassing directory restrictions.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2025-67366