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MCP 2025-11-25: Streamable HTTP transport security

Transport specification with an explicit security warning covering Origin validation, local binding and authentication. The deprecated Python SDK WebSocket helper is a separate custom transport; this document is comparative design guidance for that advisory, not proof that every MCP transport is affected.

Accessed
Oct 1, 2026
Publisher
Model Context Protocol
Source role
primary disclosure
Version
2025-11-25

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Transport specification with an explicit security warning covering Origin validation, local binding and authentication. The deprecated Python SDK WebSocket helper is a separate custom transport; this document is comparative design guidance for that advisory, not proof that every MCP transport is affected.

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DiggingBeagle. “MCP 2025-11-25: Streamable HTTP transport security.” Accessed Oct 1, 2026. https://diggingbeagle.com/sources/mcp-2025-11-25-streamable-http-transport-security/

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