CVE-2026-25904
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SSRF Vulnerability in Pydantic-AI MCP Run Python Tool

Publication date: 2026-02-09

Last updated on: 2026-02-09

Assigner: JFrog

Description
The Pydantic-AI MCP Run Python tool configures the Deno sandbox with an overly permissive configuration that allows the underlying Python code to access the localhost interface of the host to perform SSRF attacks. Note - the "mcp-run-python" project is archived and unlikely to receive a fix.
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Meta Information
Published
2026-02-09
Last Modified
2026-02-09
Generated
2026-06-16
AI Q&A
2026-02-09
EPSS Evaluated
2026-06-15
NVD
CVE-2026-25904
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
pydantic-ai mcp-run-python *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
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Executive Summary

The vulnerability exists in the Pydantic-AI MCP Run Python tool, which configures the Deno sandbox with an overly permissive setup. This configuration allows the underlying Python code to access the localhost interface of the host machine. As a result, an attacker can perform Server-Side Request Forgery (SSRF) attacks by exploiting this access.

Additionally, the project "mcp-run-python" is archived and unlikely to receive a fix, meaning the vulnerability may remain unpatched.

Impact Analysis

This vulnerability can allow attackers to perform SSRF attacks by accessing the localhost interface through the vulnerable tool. SSRF attacks can be used to access internal services, potentially leading to unauthorized information disclosure, data manipulation, or further exploitation within the internal network.

The CVSS score of 5.8 indicates a medium severity impact, with potential consequences including limited confidentiality, integrity, and availability impacts.

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