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CVE-2025-53365— MCP Python SDK has Unhandled Exception in Streamable HTTP Transport ,Leading to Denial of Service

Quick assessment

Affected
modelcontextprotocol python-sdk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Model Context Protocol Python SDK是Model Context Protocol开源的一个用于模型上下文协议服务器和客户端的开发工具。 Model Context Protocol Python SDK 1.10.0之前版本存在安全漏洞，该漏洞源于未捕获ClosedResourceError，可能导致服务崩溃。

AI Predicted 6.5 Difficulty: Easy EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-53365

Vulnerability Information
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Vulnerability Title
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport ,Leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Model Context Protocol Python SDK 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Model Context Protocol Python SDK是Model Context Protocol开源的一个用于模型上下文协议服务器和客户端的开发工具。 Model Context Protocol Python SDK 1.10.0之前版本存在安全漏洞，该漏洞源于未捕获ClosedResourceError，可能导致服务崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
modelcontextprotocol python-sdk < 1.10.0 -

II. Public POCs for CVE-2025-53365

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III. Intelligence Information for CVE-2025-53365

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Vendor Advisories for CVE-2025-53365 (1)

IV. Related Vulnerabilities

Same product: python-sdk
Same vendor: modelcontextprotocol
Same weakness: CWE-248

V. Comments for CVE-2025-53365

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