MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
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.
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beschreibt (1)
Zugehörige CVEs.
| ID | Schweregrad | ausnutzbar | ||
|---|---|---|---|---|
| CVE-2025-53365US | — | — | ||
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 af… | ||||
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Referenzen
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/advisories/GHSA-j975-95f5-7wqhADVISORY
- https://github.com/modelcontextprotocol/python-sdkPACKAGE
- https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891WEB
- https://github.com/modelcontextprotocol/python-sdk/pull/967WEB
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0WEB
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqhWEB
- https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yamlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-53365ADVISORY
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