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CVE-2026-33946

8.2 high SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 7

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.2 · lfprojectsNVD modified 2026-10-26 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:lfprojects:mcp_ruby_sdk:*:*:*:*:*:*:*:*

References 9