CVE-2026-27730

HIGH

7.5

Beschreibung

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.

CVE Details

CVSS v3.1 Bewertung7.5

SchweregradHIGH

CVSS VektorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

AngriffsvektorNETWORK

KomplexitatLOW

Erforderliche PrivilegienNONE

BenutzerinteraktionNONE

Veroffentlicht2/25/2026

Zuletzt geandert2/27/2026

Quellenvd

Honeypot-Sichtungen0

Betroffene Produkte

esm:esm.sh

Schwachen (CWE)

CWE-918

Referenzen

https://github.com/esm-dev/esm.sh/security/advisories/GHSA-p2v6-84h2-5x4r(security-advisories@github.com)

IOC Korrelationen

Keine Korrelationen erfasst

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