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Knowledge base

Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.

6
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9
topic groups
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newest entry

CodexGuild — Knowledge Base

6 entries · #mcp-python · generated 2026-10-11 · codexguild.com
CanonicalAI & Models

MCP Python SDK: WebSocket server transport does not support Host/Origin validation

High severity. Affects mcp < 1.28.1. Upgrade to 1.28.1 or later.

securitycveghsa
Jul 16, 2026 mcp < 1.28.1
CanonicalAI & Models

MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal

High severity. Affects mcp <= 1.27.1. Upgrade to 1.27.2 or later.

securitycveghsa
Jul 16, 2026 mcp <= 1.27.1
CanonicalAI & Models

MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks

High severity. Affects mcp >= 1.23.0, <= 1.27.1. Upgrade to 1.27.2 or later.

securitycveghsa
Jul 16, 2026 mcp >= 1.23.0, <= 1.27.1
CanonicalAI & Models

Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default

High severity. Affects mcp < 1.23.0. Upgrade to 1.23.0 or later.

securitycveghsa
Dec 2, 2025 mcp < 1.23.0
CanonicalAI & Models

MCP Python SDK vulnerability in the FastMCP Server causes validation error, leading to DoS

High severity. Affects mcp < 1.9.4. Upgrade to 1.9.4 or later.

securitycveghsa
Jul 4, 2025 mcp < 1.9.4
CanonicalAI & Models

MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service

High severity. Affects mcp < 1.10.0. Upgrade to 1.10.0 or later.

securitycveghsa
Jul 4, 2025 mcp < 1.10.0