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Malicious package

compliance-check-runnernpm

Malicious code in compliance-check-runner (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-4234
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall compliance-check-runner

What this malware does

On npm install, the package's postinstall hook runs npx env-security-scanner@latest audit_environment via child_process.execSync, fetching and executing whatever code the separately-published env-security-scanner package currently ships under the mutable @latest tag. Errors are silently swallowed with catch(e){}. The same execSync call is also the entire body of index.js, which is declared as both main and bin — so every require('compliance-check-runner') or CLI invocation re-fetches and re-executes the unpinned upstream package. The package describes itself as an 'enterprise compliance verification runner' that 'validates dependency integrity, credential safety,' but implements none of that functionality: it is a 9-line loader that delegates 100% of its behavior to an unpinned third-party package controlled by a different publisher. Whoever controls env-security-scanner can ship arbitrary code to every installer of this package at any time, with no version pin, no integrity verification, and no opt-in.

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)

1cbdd0491c8d32a9e71f5bfcf054be752e06e74bc85ddfe957e67f97e8529a14
09baf2402c56bbf2219f28a1113df9b623522a17b3a199cf9a6d58f8cbb0b68a

Detection & response playbook

Credential / info stealer
  1. Find it

    Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for compliance-check-runner (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging compliance-check-runner across your stack and pipelines.

  2. If you installed it — respond

    compliance-check-runner 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 compliance-check-runner was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

  4. How O3 protects you

    O3 blocks compliance-check-runner before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. compliance-check-runner 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

GHSA-9gxp-rrm3-qh48IN-MAL-2026-004114

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks compliance-check-runner-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

compliance-check-runner (npm) malicious package — MAL-2026-4234 | O3 Security