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SCA: security update for github.com/modelcontextprotocol/registry (GHSA-r48c-v28r-pf6v)

medium Tenable Self-Hosted Container Security Plugin ID 441527

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-44430)

Solution

Update the github.com/modelcontextprotocol/registry library and its related packages to version 1.7.7 or later.

See Also

https://github.com/advisories/GHSA-r48c-v28r-pf6v

Plugin Details

Severity: Medium

ID: 441527

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 5/8/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 2

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-44430

CVSS v3

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.6

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 2.9

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/8/2026

Vulnerability Publication Date: 5/8/2026

Reference Information

CVE: CVE-2026-44430

cwe: CWE-918