CVE-2026-27730: falha de alta gravidade em esm-dev esm.sh
esm.sh has SSRF localhost/private-network bypass in `/http(s)` module route
Publicada em
Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.
21Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 8.6epss 0.4%
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.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Produtos afetados
esm-dev · esm.shCVEs relacionadas — esm-dev esm.sh
No mesmo produto, das mais perigosas para as menos.
CVE-2025-59342MEDIUMesm.sh writes arbitrary files via path traversal in `X-Zone-Id` headerEPSS 3.2%CVE-2025-59341HIGHLocal File Inclusion in esm.shEPSS 1.6%CVE-2026-102657HIGHesm.sh: web.NewHandler allows arbitrary file read via encoded dot-segment path traversalEPSS 0.7%CVE-2025-65025HIGHesm.sh CDN service has arbitrary file write via tarslipEPSS 0.6%CVE-2026-23644HIGHesm.sh has path traversal in `extractPackageTarball` that enables file writes from malicious packagesEPSS 0.6%CVE-2025-65026MEDIUMesm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScriptEPSS 0.5%