Vulnerability Description
MySQL MCP Server is a Model Context Protocol server that enables secure interaction with MySQL databases. Prior to 0.4.2, setting MCP_TRANSPORT=sse causes src/mysql_mcp_server/server.py to construct SseServerTransport without security_settings or enable_dns_rebinding_protection, while the Starlette routes /, /sse, and /messages/ have no authentication and the service binds to 0.0.0.0 by default. A network attacker can directly reach execute_sql, or can use DNS rebinding to make a victim's browser relay same-origin requests to a locally bound service, and supply a query that reaches cursor.execute(query). This allows unauthenticated disclosure and modification of the configured database; when the MySQL account has FILE privileges, the same access can read or write server files and may enable code execution. The default stdio transport is not affected. This issue is fixed in 0.4.2.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/designcomputer/mysql_mcp_server/commit/a96549f4a4d65443fd6e9c
- https://github.com/designcomputer/mysql_mcp_server/issues/92
- https://github.com/designcomputer/mysql_mcp_server/releases/tag/v0.4.2
- https://github.com/designcomputer/mysql_mcp_server/security/advisories/GHSA-rqfv
FAQ
What is CVE-2026-59971?
CVE-2026-59971 is a vulnerability with a CVSS score of 10.0 (CRITICAL). MySQL MCP Server is a Model Context Protocol server that enables secure interaction with MySQL databases. Prior to 0.4.2, setting MCP_TRANSPORT=sse causes src/mysql_mcp_server/server.py to construct S...
How severe is CVE-2026-59971?
CVE-2026-59971 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-59971?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.