CVE-2025-65025: Esm Esm.sh

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Esm Esm.sh: before 136 (fixed in 136)

Published 2025-11-19. Last modified 2026-06-17.