CVE-2026-25905

MEDIUM EPSS 7.5%

Published Feb 9, 20264mo ago · Modified Jun 17, 20262w ago

5.8 CVSS 3.1

Medium

Published Feb 9, 2026 4mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

5.8

Exploitability

1.6

Impact

3.7

Vector string

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

Attack Vector Network

Attack Complexity High

Privileges Required None

User Interaction Required

Scope Changed

Confidentiality Low

Integrity Low

Availability Low

Threat Intelligence

EPSS Exploit Probability

7.5% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-653

References 1

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.