CVE-2025-66416— Model Context Protocol Python SDK 安全漏洞

DNS Rebinding Protection Disabled by Default in Model Context Protocol Python SDK for Servers Running on Localhost

The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.23.0, tThe Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication using FastMCP with streamable HTTP or SSE transport, and has not configured TransportSecuritySettings, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. Note that running HTTP-based MCP servers locally without authentication is not recommended per MCP security best practices. This issue does not affect servers using stdio transport. This vulnerability is fixed in 1.23.0.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

不安全的默认资源初始化

Model Context Protocol Python SDK 安全漏洞

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 1.23.0之前版本存在安全漏洞，该漏洞源于默认未启用DNS重绑定保护，可能导致绕过同源策略限制。

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