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 (af29bcf6fea2d386f8beb757fa38bac5f1cc6dbae984795f5fd1f4356afd83f7)
Package `bs58-11` is published under a name that resembles the popular `bs58` module. Its README self-identifies as `bs58` and instructs `npm i --save bs58`, while `package.json` declares the name as `bs58-11`. The tarball contains only a two-line wrapper (`index.cjs`) that `require`s `base65-11x` — a name resembling the legitimate `base-x` package — and immediately invokes its default export at module load. The wrapper itself contains no exfiltration, credential access, install-time fetch-and-execute, silent-relay, or backdoor code. Any behavior beyond base-x-style alphabet decoding depends on the content of the `base65-11x` dependency, which is not part of this tarball.
Source: ghsa-malware (8a9f90466ed9f42f4891cc53d4a86bd0dc7477c72e007decc817a8dcc7648093)
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.