Upstream information

CVE-2026-27730 at MITRE

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.

SUSE information

Overall state of this security issue: Does not affect SUSE products

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (GitHub) National Vulnerability Database
Base Score 8.6 7.5
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction None None
Scope Changed Unchanged
Confidentiality Impact High High
Integrity Impact None None
Availability Impact None None
CVSSv3 Version 3 3.1
No SUSE Bugzilla entries cross referenced.

No SUSE Security Announcements cross referenced.

SUSE Timeline for this CVE

CVE page created: Wed Feb 25 18:04:26 2026
CVE page last modified: Tue Mar 24 19:55:35 2026