If this package is installed
Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.
Details
Source: amazon-inspector (13895e2e8ee4aa9683c2fd6f0f873a38b19bbc5af207233e22c51668bc7dba41)
Package eth-lib-utils@5.2.3 impersonates @ethereumjs/util / ethereumjs-util (README, author list, repository URL, and source tree copied from the legitimate package). The published Node build dist/index.js contains an unconditional `require("assertcore")` at module load that is absent from the TypeScript source src/index.ts and from the parallel dist.browser/index.js — the import was injected only into the shipped artifact. The required name `assertcore` is not declared in package.json; the declared dependency is the differently-named `assertcoreutils` (^2.3.2), an unrelated name shaped to look like an Ethereum companion package. The effect on a consumer that runs `require('eth-lib-utils')` in Node is to load whatever code is published under `assertcore` / `assertcoreutils` in the installer's process, while the package presents itself as a drop-in for a widely-used Ethereum utility. This is the standard typosquat-plus-transitive-dropper shape: the lure package looks like a clean re-export, the harmful code lives one resolution hop away in a name the installer never asked for.
Source: ghsa-malware (589c50080d1bc6f3f4325e1cd580084f98378fbfced6109dbcbba5fefc0b14d7)
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.