Vulnerability Description
The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.10.0, if a client deliberately triggers an exception after establishing a streamable HTTP session, this can lead to an uncaught ClosedResourceError on the server side, causing the server to crash and requiring a restart to restore service. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures. Version 1.10.0 contains a patch for the issue.
Related Weaknesses (CWE)
References
- https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39e
- https://github.com/modelcontextprotocol/python-sdk/pull/967
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975
FAQ
What is CVE-2025-53365?
CVE-2025-53365 is a documented vulnerability. The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.10.0, if a client deliberately triggers an exception after establishing a s...
How severe is CVE-2025-53365?
CVSS scoring is not yet available for CVE-2025-53365. Check NVD for updates.
Is there a patch for CVE-2025-53365?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.