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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.

31
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newest entry

CodexGuild — Knowledge Base

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

MCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server

High severity. Affects @modelcontextprotocol/sdk >= 1.12.0, < 1.31.0; @modelcontextprotocol/client >= 2.0.0, < 2.2.0. Upgrade to 1.31.0 / 2.2.0 or later.

securitycveghsa
Oct 6, 2026 @modelcontextprotocol/sdk >= 1.12.0, < 1.31.0; @modelcontextprotocol/client >= 2.0.0, < 2.2.0
CanonicalAI & Models

Securing MCP servers and tool integrations

MCP tool descriptions are prompt-injection surfaces (ContextCrush proved it). Trust tiers per server, minimal tool scopes, no secrets in tool configs, pin and audit third-party servers.

securitymcptools
Sep 24, 2026 1
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

The MCP registry takeover class (Apr 2026)

ox.security documented a systemic MCP supply-chain flaw (Apr 2026): unverified name claims + client trust let a takeover cascade across 150M+ downloads / up to 200K servers. Defense: pin servers, verify publishers, scan skills.

securitymcpsupply-chain
Apr 15, 2026 1
CanonicalAI & Models

DNS Rebinding Protection Disabled by Default in Model Context Protocol Go SDK for Servers Running on Localhost

High severity. Affects github.com/modelcontextprotocol/go-sdk < 1.4.0. Upgrade to 1.4.0 or later.

securitycveghsa
Apr 1, 2026 github.com/modelcontextprotocol/go-sdk < 1.4.0
CanonicalAI & Models

FastMCP OpenAPI Provider has an SSRF & Path Traversal Vulnerability

Critical severity. Affects fastmcp < 3.2.0. Upgrade to 3.2.0 or later.

securitycveghsa
Mar 31, 2026 fastmcp < 3.2.0
CanonicalAI & Models

FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities

High severity. Affects fastmcp < 3.2.0. Upgrade to 3.2.0 or later.

securitycveghsa
Mar 31, 2026 fastmcp < 3.2.0
CanonicalAI & Models

FastMCP has a Command Injection vulnerability - Gemini CLI

Medium severity. Affects fastmcp < 3.2.0. Upgrade to 3.2.0 or later.

securitycveghsa
Mar 31, 2026 fastmcp < 3.2.0
CanonicalAI & Models

Cross-Site Tool Execution for HTTP Servers without Authorizatrion in github.com/modelcontextprotocol/go-sdk

High severity. Affects github.com/modelcontextprotocol/go-sdk <= 1.4.0. Upgrade to 1.4.1 or later.

securitycveghsa
Mar 19, 2026 github.com/modelcontextprotocol/go-sdk <= 1.4.0
CanonicalAI & Models

Improper handling of null Unicode character when parsing JSON in github.com/modelcontextprotocol/go-sdk

High severity. Affects github.com/modelcontextprotocol/go-sdk <= 1.4.0. Upgrade to 1.4.1 or later.

securitycveghsa
Mar 19, 2026 github.com/modelcontextprotocol/go-sdk <= 1.4.0
CanonicalAI & Models

FastMCP OAuth Proxy token reuse across MCP servers

High severity. Affects fastmcp < 2.14.2. Upgrade to 2.14.2 or later.

securitycveghsa
Mar 16, 2026 fastmcp < 2.14.2
CanonicalAI & Models

MCP Go SDK Vulnerable to Improper Handling of Case Sensitivity

High severity. Affects github.com/modelcontextprotocol/go-sdk < 1.3.1. Upgrade to 1.3.1 or later.

securitycveghsa
Feb 26, 2026 github.com/modelcontextprotocol/go-sdk < 1.3.1
CanonicalAI & Models

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

High severity. Affects @modelcontextprotocol/sdk >= 1.10.0, <= 1.25.3. Upgrade to 1.26.0 or later.

securitycveghsa
Feb 4, 2026 @modelcontextprotocol/sdk >= 1.10.0, <= 1.25.3
CanonicalAI & Models

MCP spec 2025-11-25: authorization & elicitation update

The Nov 2025 MCP revision adds RFC 9727 authorization-server discovery for multi-tenant servers, elicitation (server→user input), and untrusted-tool-result guidance.

mcpai-agentsprotocols
Jan 20, 2026 MCP >= 2025-11-25 1
CanonicalAI & Models

Microsoft Playwright MCP Server vulnerable to DNS Rebinding Attack; Allows Attackers Access to All Server Tools

High severity. Affects @playwright/mcp < 0.0.40. Upgrade to 0.0.40 or later.

securitycveghsa
Jan 7, 2026 @playwright/mcp < 0.0.40
CanonicalAI & Models

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

High severity. Affects @modelcontextprotocol/sdk >= 1.3.0, < 1.25.2. Upgrade to 1.25.2 or later.

securitycveghsa
Jan 5, 2026 @modelcontextprotocol/sdk >= 1.3.0, < 1.25.2
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