CVE-2026-44430
medium
CVSS v3
4.0
CVSS v2
—
VIR risk
4.0
Description
MCP Registry has an unauthenticated SSRF: HTTP namespace verification dials 6to4 / NAT64 / site-local IPv6 addresses, bypassing private-address allowlist
Predictions
Exploit likelihood
50%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: security-advisories@github.com — https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-r48c-v28r-pf6v
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | github.com/modelcontextprotocol/registry | <1.7.7 | 1.7.7 |
| GO | github.com/modelcontextprotocol/registry | < 1.7.7 | 1.7.7 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| lfprojects | mcp_registry | {"endExcluding":"1.7.7"} | 1.7.7 |
References
- https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-r48c-v28r-pf6v
- https://nvd.nist.gov/vuln/detail/CVE-2026-44430
- https://github.com/modelcontextprotocol/registry/pull/1250
- https://github.com/modelcontextprotocol/registry/commit/f5f40bd98084466eaf18fe48ea62a0d534caa774
- https://github.com/modelcontextprotocol/registry
- https://github.com/modelcontextprotocol/registry/releases/tag/v1.7.7
- https://github.com/advisories/GHSA-r48c-v28r-pf6v
CWEs
CWE-918
Verify integrity in audit chain (admin only). AS-IS.