If your MCP server exposes a read_file / write_file / list_dir tool, it is one clever prompt away from serving /etc/passwd to whoever controls the model's input. The naive fixes — prefix checks, os. path.

Source: [Dev.to](https://dev.to/mcpsecnotes/a-path-traversal-guard-for-mcp-file-tools-that-actually-survives-symlinks-2654)

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