Vulnerability · Published Feb 9, 2026 · Assigned by JFROG
CVE-2026-25904Overly permissive Deno configuration in mcp-run-python leads to SSRF
Medium 5.8
In plain English
A medium-severity server-side request forgery in mcp-run-python. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Severity (CVSS 3.1)5.8Medium
Exploit odds (30 days)0.2%top 91.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | mcp-run-python | no fix listed | GHSA-6fgp-m6q4-j3q5 |
| PyPI | mcp-run-python | no fix listed | PYSEC-2026-2627 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mcp-run-python | 0 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L