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CVE-2025-53365 — MCP Python SDK has Unhandled Exception in Streamable HTTP Transport ,Leading to Denial of Service

2026-09-30T22:31:34.178471+00:00

Affected: modelcontextprotocol python-sdk

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.

GHSA-j975-95f5-7wqh — MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service

2026-09-30T22:31:34.178566+00:00

Affected: PyPI: mcp

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.

Thank you to Rich Harang for reporting this issue.

PYSEC-2026-1618 — MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service

2026-09-30T22:31:34.178613+00:00

Affected: PyPI: mcp

Thank you to Rich Harang for reporting this issue.