CVE-2026-44430: modelcontextprotocol registry, SSRF

Описание

Оригинално описание

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.

Засегнати продукти

• modelcontextprotocol registry: < 1.7.7

Вид слабост

• CWE-918 Server-Side Request Forgery

История

Други уязвимости в modelcontextprotocol registry

• 2.1CVE-2026-44428
• 0.0CVE-2026-44427
• 5.1CVE-2026-44429
• 3.5CVE-2026-45781

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-44430
• https://nvd.nist.gov/vuln/detail/CVE-2026-44430
• https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-r48c-v28r-pf6v