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Malicious package

test-supply-npm-lib-4npm

Advisory published Updated

test-supply-npm-lib-4 is a confirmed malicious npm package (MAL-2026-17314) that executes malicious code on install (malicious versions 3.3.3, 3.3.4, 3.3.5…). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in test-supply-npm-lib-4 (npm)

MAL-2026-17314
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall test-supply-npm-lib-4

What this malware does

package.json declares a dependency sourced from a git URL (git+https://[email protected]/agustedone/test-supply-npm-git-prepare-proof-4.git) pinned to commit 0abd2c55e475f12f58fb67ac487db4c1b00cf597, rather than from the npm registry. On npm install, npm clones that GitHub repository and runs any lifecycle scripts it contains, including a prepare hook indicated by the dependency's name. The dependency source is an individual GitHub account (agustedone/...) unrelated to any established publisher, and the fetched code is not subject to npm registry review or integrity checks against a registry tarball. Whoever controls that GitHub repository controls code executed on the installer's machine at install time.

Malicious versions

4 flagged
3.3.33.3.43.3.53.3.6

Indicators of compromise (SHA-256)

4088f6f05dc6a2187563d3b6e47047d7206446a8642bb62d2cc2c27347418e70
80bcbaa6379206627641c70dd25da3c3adfd51337f9a378223a6f8f13c8ba3ed
3eae72a7bc74450d855cd61f154508a7b6e1419095c8d3c88c32f3e81b77b3af
44f10381ad047460986bbeedafad42f8c71db61fff98fe07c915cd0d3678d268

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for test-supply-npm-lib-4 (4 malicious versions).

  2. If you installed it — respond

    Remove test-supply-npm-lib-4 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 activity or persistence.

  3. Did it already run?

    If test-supply-npm-lib-4 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. test-supply-npm-lib-4 on npm has been identified as a malicious package (versions 3.3.3, 3.3.4, 3.3.5, 3.3.6 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020791IN-MAL-2026-020790IN-MAL-2026-020820IN-MAL-2026-020821

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks test-supply-npm-lib-4-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

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test-supply-npm-lib-4 (npm) malicious package — MAL-2026-17314 | O3 Security