CVE-2026-23644: Esm Esm.sh

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

esm.sh is a no-build content delivery network (CDN) for web development. Prior to Go pseeudoversion 0.0.0-20260116051925-c62ab83c589e, the software has a path traversal vulnerability due to an incomplete fix. `path.Clean` normalizes a path but does not prevent absolute paths in a malicious tar file. Commit https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16, corresponding to pseudoversion 0.0.0-20260116051925-c62ab83c589e, fixes this issue.

Affected products

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

Published 2026-01-18. Last modified 2026-06-17.