Python
CVE-2026-25905
MEDIUM
GHSA-pfv4-wmph-5gc6
Severity by source
AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L
Lifecycle Timeline
2Blast Radius
ecosystem impact- 1 pypi packages depend on mcp-run-python (1 direct, 0 indirect)
Ecosystem-wide dependent count for version 0.0.22.
DescriptionCVE.org
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.
AnalysisAI
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. No patch is available as the project is archived.
Technical ContextAI
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.
Affected ProductsAI
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 resul
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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External POC / Exploit Code
Leaving vuln.today