CVEvulnerability

CVE-2026-25905

5.8 MEDIUM Published 2026-02-09 Modified 2026-06-17 Official page ↗
Status
Deferred
Published
2026-02-09
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L
Weaknesses
CWE-653

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.

Related

Weakness · CWE (1)

  • CWE-653 Improper Isolation or Compartmentalization weakness

References