MySQL MCP Server: Missing Origin/Host Validation in SSE Transport Enables Unauthenticated SQL Execution (DNS Rebinding / Direct Exposure) — GHSA-RQFV-2MW9-78G2

Summary

## Summary In SSE/HTTP transport mode, `mysql_mcp_server` constructs `SseServerTransport` without passing `security_settings`. As a result, the MCP Python SDK's DNS-rebinding protection (Origin/Host header validation) is disabled; the Starlette application has no CORS or TrustedHost middleware; and the service binds to `0.0.0.0` by default with no authentication on any route. **Trigger condition:**…

Timeline

Published by source

2026-09-11

Risk context

• Reported severity or threat level: critical.
• Reported CVSS score: 10 out of 10.
• Review exposure for the affected product or family: pip: mysql-mcp-server.

Product

pip: mysql-mcp-server

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-RQFV-2MW9-78G2

Source

GitHub

Vendor

GitHub

Published by source

2026-09-11

Last source activity

2026-09-11

Additional identifiers

CVE-2026-59971

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.