What does the worker-build malware do?

The OpenSSF Package Analysis project identified 'worker-build' @ 9.0.1 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity.

Which versions of worker-build are malicious?

The following npm versions of worker-build are flagged malicious: 9.0.1. Treat any of these as compromised.

How do I remediate worker-build if I installed it?

Remove worker-build from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound network activity or persistence. Use O3 Security's dependency scanner to confirm the package and its artifacts are fully purged across your stack.

Can O3 Security detect worker-build in my codebase?

Yes. O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, blocking worker-build and packages like it before any post-install script runs.

Malicious package

worker-buildnpm

Malicious code in worker-build (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-5677

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall worker-build

What this malware does

The OpenSSF Package Analysis project identified 'worker-build' @ 9.0.1 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.

Malicious versions

1 flagged

9.0.1

Indicators of compromise (SHA-256)

b5005e4bec545b403f3be10160a08d634d34b5d8ab8e76a185a4a5ba34706719

Frequently asked questions

No. worker-build on npm has been identified as a malicious package (version 9.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

OpenSSF: Package Analysis · finder

Scan your dependencies

O3 Security blocks malicious packages like this at install time and in CI.

Supply-chain protection