Python path-traversal guard secures MCP servers against symlink exploits
Tactic · dev.to · stat: 7 lines Model Context Protocol (MCP) servers exposing file tools remain vulnerable to path-traversal attacks through symlinks that bypass naive string-based sanitization. A…
Tactic · dev.to · stat: 7 lines
Model Context Protocol (MCP) servers exposing file tools remain vulnerable to path-traversal attacks through symlinks that bypass naive string-based sanitization. A new security implementation uses Python's pathlib library to resolve canonical paths before checking directory containment. The method prevents prompt-injection exploits from accessing sensitive system files by deploying a strict 7-line containment check.
String-based sanitization is failing the transition to agentic LLM tools Founders building MCP-based AI agents must audit their file-system tools to prevent prompt injections from reading sensitive host files.
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