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Vulnerability record · CVE-2026-44594 · published 28 May 2026

CVE-2026-44594: Path traversal vulnerability

esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, a Local File Inclusion (LFI) vulnerability exists in the esbuild plugin's handling of the browser field in package.json. An attacker can publish an npm package that causes the server to read and return arbitrary files from the host filesystem during the build process.

7.5 CVSS 3.1 High EPSS 0.48% · top 61.0% CWE-22 · Path traversal Deferred
7.5CVSS 3.1 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, a Local File Inclusion (LFI) vulnerability exists in the esbuild plugin's handling of the browser field in package.json. An attacker can publish an npm package that causes the server to read and return arbitrary files from the host filesystem during the build process.

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

References

LinkTags
https://github.com/esm-dev/esm.sh/security/advisories/GHSA-rg65-45m7-hq57
https://github.com/esm-dev/esm.sh/security/advisories/GHSA-rg65-45m7-hq57

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Source: NIST National Vulnerability Database (record CVE-2026-44594), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.