Security Advisory

CVE-2026-27730

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-02-25 15:37:01

Last updated 2026-02-25 20:32:05

Assigner GitHub_M

State PUBLISHED

Description

esm.sh is a no-build content delivery network (CDN) for web development. Versions up to and including 137 have an SSRF vulnerability (CWE-918) 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. This allows an external requester to make the esm.sh server fetch internal localhost services. As of time of publication, no known patched versions exist.

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