CVE-2026-25904 — MEDIUM (5.8)

Vulnerability 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.

CVSS Score

5.8

MEDIUM

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

Related Weaknesses (CWE)

CWE-918

References

https://research.jfrog.com/vulnerabilities/mcp-run-python-deno-ssrf-jfsa-2026-00

FAQ

What is CVE-2026-25904?

CVE-2026-25904 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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 ...

How severe is CVE-2026-25904?

CVE-2026-25904 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-25904?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.