Lfprojects Mcp Ruby Sdk vulnerabilities

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Published CVEs affecting Lfprojects Mcp Ruby Sdk: 1 record(s), with affected versions and fixes.
cpe:2.3:a:lfprojects:mcp_ruby_sdk

CVE-2026-33946 Medium · 5.9 CWE-384 Mar 27, 2026

MCP Ruby SDK: Insufficient Session Binding Allows SSE Stream Hijacking via Session ID Replay

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.