Maliciously prepared software packages are an extensively leveraged weapon for software supply chain attacks. The detection of malicious packages is undoubtedly of high priority and many academic and commercial approaches have been developed. In the inevitable case of an attack, one needs resilience against malicious code. To this end, we present a runtime protection for Node.js that automatically limits a package's capabilities to an established minimum. The detection of required capabilities as well as their enforcement at runtime has been implemented and evaluated against known malicious attacks. Our approach was able to prevent 9/10 historic attacks with a median install-time overhead of less than 0.6 seconds and a median runtime overhead of less than 0.2 seconds.