CVE-2026-25904 MEDIUM

CVE-2026-25904: Overly permissive Deno configuration in mcp-run-python leads to SSRF

Weakness CWE-918 · SSRF

Published February 9, 2026

Last update February 9, 2026

View on NVD All CVEs

CVSS base score

5.8/10

Attack vector Network

Attack complexity High

Privileges required None

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

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

What the vulnerability does

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.

Key dates

Disclosure timeline

February 9, 2026 CVE published

February 9, 2026 Record updated