Dormant npm Packages Poisoned With a Loader That Hides Its Server on Ethereum

On the evening of November 3, 2026, someone published six new versions of four npm packages whose last regular releases date from 2018 to 2021. Each release carries a hidden loader that looks up its server’s address in Ethereum transactions, then downloads more code and runs it in memory.

The releases were caught by Greenflagged, a private npm registry that only serves packages that pass its review. Its write-up by Sean Madden is, at the time of writing, the only detailed analysis.

Source: Privacy Affairs · 2026-11-04