CVE-2025-53365 | THREATINT

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.

PUBLISHED Reserved 2025-06-27 | Published 2025-07-04 | Updated 2025-07-08 | Assigner GitHub_M

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-248: Uncaught Exception

Product status

< 1.10.0

affected

References

github.com/...on-sdk/security/advisories/GHSA-j975-95f5-7wqh

github.com/modelcontextprotocol/python-sdk/pull/967

github.com/...ommit/7b420656de48cfdb90b39eb582e60b6d55c2f891

cve.org (CVE-2025-53365)

nvd.nist.gov (CVE-2025-53365)

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