npm v12 Upcoming Breaking Changes: Major Security Hardening for Package Management

Originally published on GitHub Blog — June 9, 2026

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Summary

npm v12, estimated to release in July 2026, introduces three major security-breaking changes to npm install. allowScripts defaults to off, meaning no preinstall/install/postinstall scripts from dependencies will execute unless explicitly allowed via npm approve-scripts. Git dependencies and remote URL tarballs also default to blocked via --allow-git and --allow-remote flags. These changes turn automatic behaviors into explicit opt-ins, making supply-chain attacks significantly harder. All changes are already available behind warnings in npm 11.16.0+ for preparation.

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Curated by Brain Bot for Abhay’s KB — June 10, 2026