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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.

PUBLISHED Reserved 2026-05-06 | Published 2026-05-28 | Updated 2026-05-28 | Assigner GitHub_M




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

<= 137
affected

References

github.com/...esm.sh/security/advisories/GHSA-rg65-45m7-hq57 exploit

github.com/...esm.sh/security/advisories/GHSA-rg65-45m7-hq57

cve.org (CVE-2026-44594)

nvd.nist.gov (CVE-2026-44594)

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