esm.sh is a nobuild content delivery network(CDN) for modern web development. Prior to version 136, the esm.sh CDN service is vulnerable to path traversal during NPM package tarball extraction. An attacker can craft a malicious NPM package containing specially crafted file paths (e.g., package/../../tmp/evil.js). When esm.sh downloads and extracts this package, files may be written to arbitrary locations on the server, escaping the intended extraction directory. This issue has been patched in version 136.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16 Patch
- https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpw Exploit, Vendor Advisory
- https://github.com/esm-dev/esm.sh/security/advisories/GHSA-h3mw-4f23-gwpw Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 9.8 · esmNVD modified 2026-10-18 20:10
Affected (CPE criteria) 1
cpe:2.3:a:esm:esm.sh:*:*:*:*:*:*:*:*