Which versions of ac-array are malicious?

The following npm versions of ac-array are flagged malicious: 99.9.9. Treat any of these as compromised.

How do I remediate ac-array if I installed it?

Remove ac-array 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.

I already installed ac-array — how do I know if it already compromised me?

If ac-array 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.

Is ac-array part of a known attack campaign?

Yes — ac-array is associated with the RLMA-2026-01085 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find ac-array across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for ac-array (version 99.9.9).

Malicious package

ac-arraynpm

Advisory published Feb 6, 2026Updated Mar 19, 2026

ac-array is a confirmed malicious npm package (MAL-2026-775) that executes malicious code on install (malicious version 99.9.9). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in ac-array (npm)

MAL-2026-775

Immediate action

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

npm uninstall ac-array

What this malware does

The package ac-array was found to contain malicious code.

Malicious versions

1 flagged

99.9.9

Indicators of compromise (SHA-256)

71f97348d3034afc8a89167b165172d331574fdeffd79f9392a282ff5732635f

8f93078deb838e3641a56895b08efd471ef8c96f4c41515a0fdc76ece796d846

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for ac-array (version 99.9.9).
If you installed it — respond
Remove ac-array 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.
Did it already run?
If ac-array 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. ac-array on npm has been identified as a malicious package (version 99.9.9 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-01085

Credits

Amazon Inspector · finder
ReversingLabs · finder

Detect & block this

O3 blocks ac-array-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

Explore

All malware advisories How O3 detects malware Vulnerability database