CVE-2025-53366 Information

Description

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.

Reference

https://github.com/modelcontextprotocol/python-sdk/commit/29c69e6a47d0104d0afcea6ac35e7ab02fde809a https://github.com/modelcontextprotocol/python-sdk/pull/822 https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-3qhf-m339-9g5v

Related CNNVD

CNNVD-202507-510 (Published: 2025-07-04)