The Python code being run by runPython or runPythonAsync is not isolated from the rest of the JS code, allowing any Python code to use the Pyodide APIs to modify the JS environment. This may result in an attacker hijacking the MCP server - for malicious purposes including MCP tool shadowing. Note - the mcp-run-python project is archived and unlikely to receive a fix.
Weakness
The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions.