modelcontextprotocol/csharp-sdk

modelcontextprotocol/csharp-sdk

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csharp.sdk.modelcontextprotocol.iocsharp.sdk.modelcontextprotocol.io
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The official C# SDK for Model Context Protocol servers and clients. Maintained in collaboration with Microsoft.
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CVE History

CVEPublishedCVSS v3CVSS v2
CVE-2026-33946↗
5.9 MEDIUM—

MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients. Prior to version 0.9.2, the Ruby SDK's streamable_http_transport.rb implementation contains a session hijacking vulnerability. An attacker who obtains a valid session ID can completely hijack the victim's Server-Sent Events (SSE) stream and intercept all real-time data. Version 0.9.2 contains a patch.