Is mcp affected by CVE-2025-53365?

PyPI mcp is affected in <1.10.0.

Is CVE-2025-53365 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

high

CVE-2025-53365

Q: Is CVE-2025-53365 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

PyPI · mcp

Summary

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

Severity: high
EPSS: 0.4% (p27)
Also known as: GHSA-j975-95f5-7wqh
Published: 2025-07-04

References

https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh
https://nvd.nist.gov/vuln/detail/CVE-2025-53365
https://github.com/modelcontextprotocol/python-sdk/pull/967

Related advisories

CVE-2026-33946 — high · RubyGems/mcp
CVE-2025-66416 — high · PyPI/mcp
CVE-2025-53366 — high · PyPI/mcp

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.