CVE-2026-25905

CVSS Score & Metrics

Base Score

5.8 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L                                    

Vulnerability 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.

Vulnerability Details

Published Date

February 09, 2026

Last Modified

February 12, 2026

CWE ID

CWE-653

Source

NVD

Vendor

pip

Product

mcp-run-python

External References

https://research.jfrog.com/vulnerabilities/mcp-run-python-lack-of-isolation-mcp-takeover-jfsa-2026-001653030/

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

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