Overly permissive Deno configuration in mcp-run-python leads to SSRF
Priority MEDIUM 59CWE-918Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00189 8th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | mcp-run-python | all versions | — | No fix listed | CNA |
| — | mcp-run-python (PyPI) | up to 0.0.22 | — | No fix listed | GHSA-6fgp-m6q4-j3q5 |
- mcp-run-python Vendor— Affected all versions Fixed in — No fix listed CNA
- mcp-run-python (PyPI) Vendor— Affected up to 0.0.22 Fixed in — No fix listed GHSA-6fgp-m6q4-j3q5
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-25904
- 2026-10-03 Alias added: GHSA-6fgp-m6q4-j3q5
References
Sources
- CVE-2026-25904 · CVE Program
- CVE-2026-25904 · NVD
- FIRST EPSS
- GHSA-6fgp-m6q4-j3q5 · GitHub Advisory Database · CC BY 4.0
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