CVE-2026-44430

Katalog CVE

CVSS 4.0 · Medium EPSS 0,29%

Kerentanan Server-Side Request Forgery (SSRF) pada lfprojects mcp registry. Skor CVSS 3.1 4.0 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

14 Mei 2026

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

4.0 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-918: Server-Side Request Forgery (SSRF)

EPSS (30 hari)

0,29% peluang dieksploitasi; lebih tinggi dari 19,5% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-r48c-v28r-pf6v exploit · advisory vendor