How App Developers Can Defend Node.js Codebases Against Prototype Pollution

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A developer has responded to a post by Node.js core contributor Matteo Collina, who argued that prototype pollution is an integrity issue rather than a security one, and not Node.js core's responsibility to fix. The response proposes that application authors can instead use tools like HardenedJS and LavaMoat to protect their own codebases. The central technique involves freezing JavaScript intrinsics — for example, using Object.freeze(Object.prototype) — so that attempts to pollute Object.prototype throw a TypeError instead of silently succeeding. The SES package provides a lockdown() function that implements this hardening with additional fixes to maintain ecosystem compatibility. For production use, developers are advised to start with a less strict configuration, as demonstrated by the @lavamoat/react-native-lockdown package settings.

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ProgrammingDEV Community ·

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