CVE-2025-53366
MCP SDK Vulnerable to FastMCP Server Validation Error, Leading to Denial of Service
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MCP SDK Vulnerable to FastMCP Server Validation Error, Leading to Denial of Service
The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.9.4, a validation error in the MCP SDK can cause an unhandled exception when processing malformed requests, resulting in service unavailability (500 errors) until manually restarted. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures. Version 1.9.4 contains a patch for the issue.
Reserved 2025-06-27 | Published 2025-07-04 | Updated 2025-07-04 | Assigner GitHub_Mgithub.com/...on-sdk/security/advisories/GHSA-3qhf-m339-9g5v
github.com/modelcontextprotocol/python-sdk/pull/822
github.com/...ommit/29c69e6a47d0104d0afcea6ac35e7ab02fde809a
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