Adds isSafeURL() + isPrivateOrMetadataIP() in mcp.go and wires the
check into:
- MCP delegate_task (sync path) — line 530
- MCP delegate_task_async (fire-and-forget) — line 602
- a2a_proxy resolveAgentURL() — line 391
Blocklist covers: RFC-1918 private (10/8, 172.16/12, 192.168/16),
cloud metadata link-local (169.254/16), carrier-grade NAT (100.64/10),
documentation ranges (192.0.2/24, 198.51.100/24, 203.0.113/24),
loopback, unspecified, and link-local multicast.
For hostnames, DNS is resolved and every returned IP is validated —
blocks internal hostnames that resolve to private ranges.
Closes: #1130 (F1083 — SSRF in A2A proxy and MCP bridge)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Molecule AI CP-BE
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