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

CAO 8.7CVE-2025-53365 · GHSA-j975-95f5-7wqh · PYSEC-2026-1618 · Công bố 04/07/2025 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2025-53365 là lỗ hổng mức CAO (CVSS 8.7) ảnh hưởng mcp.
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.42%, cao hơn 36.2% các lỗ hổng khác.
Cách xử lý: cập nhật lên 1.10.0 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
mcp PyPI	`< 1.10.0`	`1.10.0`

Mô tả

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.

Mô tả của NVD

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.