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MCP Registry has an unauthenticated SSRF: HTTP namespace verification dials 6to4 / NAT64 / site-local IPv6 addresses, bypassing private-address allowlist

🗓️ 08 May 2026 17:20:56Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 4 Views

Unauthenticated Registry HTTP namespace verification enables SSRF via sixtofour, NAT64, and site-local IPv6 addresses.

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15 May 2026 23:46Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.14
CVSS 46.3
EPSS0.00027
SSVC
4