CVE-2026-33946 in modelcontextprotocol ruby-sdkinfo

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.

Responsible

GitHub_M

Reservation

03/24/2026

Disclosure

03/28/2026

Entries

VulDB provides additional information and datapoints for this CVE:

ID	Vulnerability	CWE	Exp	Cou	CVE
353985	modelcontextprotocol ruby-sdk streamable_http_transport.rb session fixiation	384	Not defined	Official fix	CVE-2026-33946

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