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CVE-2025-53365

MCP Python SDK has Unhandled Exception in Streamable HTTP Transport ,Leading to Denial of Service PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
modelcontextprotocol / python-sdkaffected < 1.10.0

CWE

CWE-248

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.