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Malicious package

eslint-config-compact-basenpm

Advisory published Updated

eslint-config-compact-base is a confirmed malicious npm package (MAL-2026-17157) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

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

MAL-2026-17157
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall eslint-config-compact-base

What this malware does

index.js executes on module load and collects host reconnaissance data — os.platform(), os.hostname(), os.userInfo().username, architecture, Node version, current working directory — together with CI-context environment variables including CI, RUNNER_NAME, and GITHUB_REPOSITORY. The collected values are serialized as query-string parameters and sent via https.get to the hardcoded endpoint https://cbrsuo9293.execute-api.us-east-1.amazonaws.com/c. The behavior fires unconditionally on require(), so any build, install, or CI job that pulls in this ESLint config beacons its host identity and repository name to the attacker-controlled AWS API Gateway. This network activity has no relationship to the package's advertised purpose as an ESLint configuration.

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.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

dbc01e3a8316b2d4e11b34a9c8cbe1cf5bd2af83a6a70052e40a22b54f13f78b
bb38df9decede154ba66b91613d2ab06bd1f94793f78fb7519da2a334a0a46be

Detection & response playbook

Credential / info stealer
  1. Find it

    Search your lockfiles and build artifacts for eslint-config-compact-base (version 1.0.0).

  2. If you installed it — respond

    eslint-config-compact-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-compact-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-compact-base on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020511GHSA-gx7g-jjf6-c7jg

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks eslint-config-compact-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.

Explore

eslint-config-compact-base (npm) malicious package — MAL-2026-17157 | O3 Security