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      <title>CVE-2026-59950 — MCP Python SDK: WebSocket server transport does not support Host/Origin validation</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-59950</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; modelcontextprotocol python-sdk&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; modelcontextprotocol python-sdk&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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