The 'buffer-utilities' npm package (versions 1.0.0, 1.1.0, and 1.1.1) is a malicious package that impersonates the legitimate 'buffer' package by copying its metadata. It contains code that, when imported, base64-decodes a URL pointing to a mutable JSON paste on jsonkeeper.com and fetches JavaScript code from this URL. The fetched code is then executed via eval(), allowing an attacker who controls the paste to run arbitrary code with full privileges on the host system. This design enables dynamic and stealthy remote code execution without any version bump or package update. The package is considered fully compromising any system where it is installed or running.

Any system that imports the 'buffer-utilities' package versions 1.0.0, 1.1.0, or 1.1.1 is at risk of full compromise. The package executes arbitrary JavaScript code fetched from a remote mutable source with full process privileges, potentially allowing attackers to execute any commands, steal secrets, or take complete control of the system. The compromise includes risk to all secrets and keys stored on the affected system, which should be considered exposed.

Remove the 'buffer-utilities' package immediately from all affected systems. Rotate all secrets, keys, and credentials that were stored or accessible on the compromised systems from a separate, trusted environment. Because the package enables full system compromise, assume the system may be persistently compromised and consider rebuilding or thoroughly investigating the affected hosts. There is no official patch or fix available; the package is malicious by design and should not be used.