7.6
High
CVE-2026-59950 The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP)
Description
The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.28.1, the deprecated mcp.server.websocket.websocket_server transport accepted WebSocket handshakes without applying Host or Origin header validation, leaving no SDK-level way to restrict which origins could connect to applications that exposed that transport. This issue is fixed in version 1.28.1.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| python-sdk 1.28 | earliest → < 1.28.1 | 1.28.1 |
Other CVEs of python-sdk
The 11 CVEs of python-sdk →
CVE-2026-116686
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients
6.5
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CVE-2026-116685
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients
5.9
Medium
CVE-2026-116684
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients
6.8
Medium
CVE-2026-109527
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients
7.5
High