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GO-2026-5607 MCP Registry has an unauthenticated SSRF: HTTP namespace verification dials 6to4 / NAT64 / site-local IPv6 addresses, bypassing private-address allowlist in github.com/modelcontextprotocol/registry

🗓️ 25 Jun 2026 22:34:34Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 3 Views

MCP Registry unauthenticated server side forgery via HTTP verification to IPv6 addresses, bypassing private address allowlist.

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