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Vulnerabilities

CVE-2026-25905 | BDVDB-2026-314558 Detail

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact low. Attack vector: network.

Weaknesses#

  • CWE-653 Improper Isolation or Compartmentalization

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.