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@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

🗓️ 04 Feb 2026 20:04:16Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 12 Views

Cross-client data leak when one MCP server and transport are reused across concurrent connections.

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09 Feb 2026 14:52Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.17.1
EPSS0.00016
SSVC
12