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GHSA-5P9G-J988-PCWV MCP Ruby SDK: Ruby SSE Session Poisoning

🗓️ 30 Jul 2026 14:44:28Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 2 Views

Missing session ownership validation in the Ruby MCP SDK enables a stolen session to execute tools via SSE.

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30 Jul 2026 15:00Current
6Medium risk
Vulners AI Score6
CVSS 48.3
EPSS0.00276
2