Is CVE-2026-27730 actively exploited?

No active exploitation of CVE-2026-27730 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27730 be exploited remotely?

Yes. CVE-2026-27730 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27730?

CVE-2026-27730 has a CVSS score of 7.5 (HIGH) and an EPSS exploitation probability of 0.03%.

HOME VULNERABILITIESCVE-2026-27730

HIGH

CVE-2026-27730

CWE-918Published: February 25, 2026· Updated: Feb 27, 2026

7.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.8th

Official 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.

NVD Source

Technical Analysis

CVE-2026-27730 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.