CVE-2025-65025 — esm.sh CDN service has arbitrary file write via tarslip
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 tar…
Published: 2025-11-19 · CVSS: 8.2 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7