# CVE-2025-53365

## Summary

- **CVE ID:** CVE-2025-53365
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-248
- **Published:** Jul 4, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- modelcontextprotocol — python-sdk (< 1.10.0)

## References

- [CNA](https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh)
- [CNA](https://github.com/modelcontextprotocol/python-sdk/pull/967)
- [CNA](https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 29.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._