CVE-2026-27730

HIGH

7.5

Descricao

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.

Detalhes CVE

Pontuacao CVSS v3.17.5

SeveridadeHIGH

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

Vetor de ataqueNETWORK

ComplexidadeLOW

Privilegios necessariosNONE

Interacao do usuarioNONE

Publicado2/25/2026

Ultima modificacao2/27/2026

Fontenvd

Avistamentos honeypot0

Produtos afetados

esm:esm.sh

Fraquezas (CWE)

CWE-918

Referencias

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

Correlacoes IOC

Sem correlacoes registradas

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