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Malicious package

eslint-config-zeallat-basenpm

Advisory published Updated

eslint-config-zeallat-base is a confirmed malicious npm package (MAL-2025-190772) that steals credentials and exfiltrates sensitive data (malicious version 1.0.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in eslint-config-zeallat-base (npm)

MAL-2025-190772
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall eslint-config-zeallat-base

What this malware does

The package eslint-config-zeallat-base was found to contain malicious code.

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.

This package was compromised by the Sha1-Hulud: The Second Coming NPM worm. The malicious payload steals tokens and credentials and publishes them to GitHub. The worm will propogate itself to NPM packages the user owns and establish persistence is a GitHub action. The package may also destroy the user's home directory.

Malicious versions

1 flagged
1.0.4

Indicators of compromise (SHA-256)

1b6b1b328e6d7538d35679194c6cec4543d7fe1ccd66a25ff5b76f43f7cd032a
b28fe7c28614bd60fe323d92db35df502ed3c1c9076a708815031e1a78311c6e
7ab87d5e56f014c8cbb0074b224c7beb4646b89983e09936b54bc85c969d3b20

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for eslint-config-zeallat-base (version 1.0.4).

  2. If you installed it — respond

    eslint-config-zeallat-base is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If eslint-config-zeallat-base was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. eslint-config-zeallat-base on npm has been identified as a malicious package (version 1.0.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GHSA-f67v-pxvp-9p9v

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks eslint-config-zeallat-base-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database
eslint-config-zeallat-base (npm) malicious package — MAL-2025-190772 | O3 Security