cvedb.io
CVE-2026-33946
MEDIUM · CVSS 5.9
EPSS exploitation probability: 0%
Published 2026-03-27T22:16:21.580 · Last modified 2026-06-17T10:38:20.883

Summary

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.

Affected products

lfprojects — mcp_ruby_sdk

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.