CVE-2026-25905

MEDIUM
2026-02-09 [email protected] GHSA-pfv4-wmph-5gc6
5.8
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Feb 09, 2026 - 09:16 nvd
MEDIUM 5.8

Tags

Python AI / ML

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.

Analysis

Python code execution through Pyodide in the mcp-run-python library lacks isolation from the JavaScript environment, enabling attackers to manipulate the JS runtime and hijack MCP server functionality. This allows adversaries to perform malicious operations including tool shadowing and potential server compromise through crafted Python payloads. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

29
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +29
POC: 0

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CVE-2026-25905 vulnerability details – vuln.today
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