CVE-2026-25905
Medium
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.
SeverityMedium
CVSS5.8
Exploit probability—
ProductMcp-run-python
PublishedFeb 9, 2026
First seenFeb 9, 2026
Weakness typeCWE-653CWE-653
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mcp-run-pythonPyPI | v ≤ 0.0.22 | — |
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