CVE-2026-27730

HIGH

7.5

Descripcion

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.

Detalles CVE

Puntuacion CVSS v3.17.5

SeveridadHIGH

Vector CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vector de ataqueNETWORK

ComplejidadLOW

Privilegios requeridosNONE

Interaccion usuarioNONE

Publicado2/25/2026

Ultima modificacion2/27/2026

Fuentenvd

Avistamientos honeypot0

Productos afectados

esm:esm.sh

Debilidades (CWE)

CWE-918

Referencias

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

Correlaciones IOC

Sin correlaciones registradas

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