{"id":"EUVD-2026-30488","revision":"2e31cce15f164f9daac46a6599491ec3","records":[{"revision":"2e31cce15f164f9daac46a6599491ec3","observedAt":"2026-10-28T06:07:36.184+00:00","statement":{"source":"euvd","id":"EUVD-2026-30488","aliases":["CVE-2026-44430","GHSA-r48c-v28r-pf6v"],"title":"The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. Prior to 1.7.7, the Registry's HTTP-based namespace verification (POST /v0/auth/http, POST /v0.1/auth/http) uses safeDialContext (internal/…","description":"The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. Prior to 1.7.7, the Registry's HTTP-based namespace verification (POST /v0/auth/http, POST /v0.1/auth/http) uses safeDialContext (internal/api/handlers/v0/auth/http.go:67-110) to refuse dialling private/internal addresses when fetching the well-known public-key file from a publisher-supplied domain. The blocklist (isBlockedIP, lines 125-133) relies entirely on Go stdlib's IsLoopback / IsPrivate / IsLinkLocalUnicast / IsMulticast / IsUnspecified plus a manual CGNAT range. None of these cover IPv6 6to4 (2002::/16), NAT64 (64:ff9b::/96 and 64:ff9b:1::/48 per RFC 8215), or deprecated site-local (fec0::/10) — all of which encode arbitrary IPv4 in the address bits and tunnel to RFC1918 / cloud-metadata services on dual-stack / NAT64-enabled hosts. This vulnerability is fixed in 1.7.7.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N","score":6.3,"severity":null}],"references":["https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-r48c-v28r-pf6v"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30488","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 14, 2026, 9:02:40 PM","dateUpdated":"May 15, 2026, 6:05:09 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-30488","identifiers":["EUVD-2026-30488","CVE-2026-44430","GHSA-r48c-v28r-pf6v"]},"retained":false,"historicalAffected":[]}],"coverage":[]}