CVE-2026-27730 Detail
Received
This CVE record has recently been published to the CVE List and has been included within the NVD dataset. Descriptionesm.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. Metrics
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CVSS 4.0 Severity and Vector Strings:
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Weakness Enumeration
Quick InfoCVE Dictionary Entry:CVE-2026-27730 NVD Published Date: 02/25/2026 NVD Last Modified: 02/25/2026 Source: GitHub, Inc. |
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