CVE-2026-27730: esm.sh has SSRF localhost/private-network bypass in `/http(s)` module route

An SSRF vulnerability (CWE-918) exists in esm.sh’s /http(s) fetch route. The service tries to block localhost/internal targets, but the validation is based on hostname string checks and can be bypassed using DNS alias domains (for example, 127.0.0.1.nip.io resolving to 127.0.0.1). This allows an external requester to make the esm.sh server fetch internal localhost services. Severity: High (depending on deployment network exposure).