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mcp 1.27.2 | Vulnerabilities | Sonatype Guide
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pypi
mcp
1.27.2
mcp 1.27.2
Published
May 29, 2026
•
Policy
compliance
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8.1
CVE-2026-59950
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
Severity
High
Published
Jul 16, 2026
