CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-44430

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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 8.0%

CVSS Severity

CVSS v3 Score 4.0

References

Products affected by CVE-2026-44430

Lfprojects » Mcp Registry » Version: 0.0.1

cpe:2.3:a:lfprojects:mcp_registry:0.0.1
Lfprojects » Mcp Registry » Version: 0.0.2

cpe:2.3:a:lfprojects:mcp_registry:0.0.2
Lfprojects » Mcp Registry » Version: 0.0.3

cpe:2.3:a:lfprojects:mcp_registry:0.0.3
Lfprojects » Mcp Registry » Version: 1.0.0

cpe:2.3:a:lfprojects:mcp_registry:1.0.0
Lfprojects » Mcp Registry » Version: 1.1.0

cpe:2.3:a:lfprojects:mcp_registry:1.1.0
Lfprojects » Mcp Registry » Version: 1.2.0

cpe:2.3:a:lfprojects:mcp_registry:1.2.0
Lfprojects » Mcp Registry » Version: 1.2.1

cpe:2.3:a:lfprojects:mcp_registry:1.2.1
Lfprojects » Mcp Registry » Version: 1.2.2

cpe:2.3:a:lfprojects:mcp_registry:1.2.2
Lfprojects » Mcp Registry » Version: 1.2.3

cpe:2.3:a:lfprojects:mcp_registry:1.2.3
Lfprojects » Mcp Registry » Version: 1.3.0

cpe:2.3:a:lfprojects:mcp_registry:1.3.0
Lfprojects » Mcp Registry » Version: 1.3.1

cpe:2.3:a:lfprojects:mcp_registry:1.3.1
Lfprojects » Mcp Registry » Version: 1.3.10

cpe:2.3:a:lfprojects:mcp_registry:1.3.10
Lfprojects » Mcp Registry » Version: 1.3.2

cpe:2.3:a:lfprojects:mcp_registry:1.3.2
Lfprojects » Mcp Registry » Version: 1.3.3

cpe:2.3:a:lfprojects:mcp_registry:1.3.3
Lfprojects » Mcp Registry » Version: 1.3.4

cpe:2.3:a:lfprojects:mcp_registry:1.3.4
Lfprojects » Mcp Registry » Version: 1.3.5

cpe:2.3:a:lfprojects:mcp_registry:1.3.5
Lfprojects » Mcp Registry » Version: 1.3.6

cpe:2.3:a:lfprojects:mcp_registry:1.3.6
Lfprojects » Mcp Registry » Version: 1.3.7

cpe:2.3:a:lfprojects:mcp_registry:1.3.7
Lfprojects » Mcp Registry » Version: 1.3.8

cpe:2.3:a:lfprojects:mcp_registry:1.3.8
Lfprojects » Mcp Registry » Version: 1.3.9

cpe:2.3:a:lfprojects:mcp_registry:1.3.9
Lfprojects » Mcp Registry » Version: 1.4.0

cpe:2.3:a:lfprojects:mcp_registry:1.4.0
Lfprojects » Mcp Registry » Version: 1.4.1

cpe:2.3:a:lfprojects:mcp_registry:1.4.1
Lfprojects » Mcp Registry » Version: 1.5.0

cpe:2.3:a:lfprojects:mcp_registry:1.5.0
Lfprojects » Mcp Registry » Version: 1.6.0

cpe:2.3:a:lfprojects:mcp_registry:1.6.0
Lfprojects » Mcp Registry » Version: 1.7.0

cpe:2.3:a:lfprojects:mcp_registry:1.7.0
Lfprojects » Mcp Registry » Version: 1.7.1

cpe:2.3:a:lfprojects:mcp_registry:1.7.1
Lfprojects » Mcp Registry » Version: 1.7.2

cpe:2.3:a:lfprojects:mcp_registry:1.7.2
Lfprojects » Mcp Registry » Version: 1.7.3

cpe:2.3:a:lfprojects:mcp_registry:1.7.3
Lfprojects » Mcp Registry » Version: 1.7.4

cpe:2.3:a:lfprojects:mcp_registry:1.7.4
Lfprojects » Mcp Registry » Version: 1.7.5

cpe:2.3:a:lfprojects:mcp_registry:1.7.5
Lfprojects » Mcp Registry » Version: 1.7.6

cpe:2.3:a:lfprojects:mcp_registry:1.7.6

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-44430

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