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PYSEC-2026-1616 MCP Python SDK vulnerability in the FastMCP Server causes validation error, leading to DoS

🗓️ 07 Jul 2026 16:02:56Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 5 Views

MCP Python SDK validation error causes unhandled exceptions on malformed requests, leading to DoS.

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07 Jul 2026 17:47Current
7High risk
Vulners AI Score7
CVSS 48.7
EPSS0.05693
5