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CVE-2026-59950

7.6 high SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 3

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.6 · lfprojectsNVD modified 2026-10-24 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:lfprojects:mcp_python_sdk:*:*:*:*:*:*:*:*

References 4