CVE-2026-23644 esm.sh has path traversal in `extractPackageTarball` that enables file writes from malicious packages

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...

Embedded Malicious Code

Overview Affected versions of this package are vulnerable to Embedded Malicious Code in the form of malicious .m4 files in the tarball distributions which have since been taken down. These malicious build files contain build instructions not present in the upstream repository...