Which versions of ac-feature are malicious?

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

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

Remove ac-feature 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-feature — how do I know if it already compromised me?

If ac-feature 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-feature part of a known attack campaign?

Yes — ac-feature is associated with the RLMA-2026-01091 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-feature across my projects, lockfiles, and CI pipelines?

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

Malicious package

ac-featurenpm

Advisory published Feb 6, 2026Updated Mar 19, 2026

ac-feature is a confirmed malicious npm package (MAL-2026-781) 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-feature (npm)

MAL-2026-781

Immediate action

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

npm uninstall ac-feature

What this malware does

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

Malicious versions

1 flagged

99.9.9

Indicators of compromise (SHA-256)

d4336ebc941f06184c39e082b6d53167ba1466dad57a4a05936446980dd4759b

d2d58399bf9d268e0668bec316122d1c03a653db2acd669b3f4e9e910e11d0b1

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for ac-feature (version 99.9.9).
If you installed it — respond
Remove ac-feature 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-feature 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-feature 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-2026-01091

Credits

Amazon Inspector · finder
ReversingLabs · finder

Detect & block this

O3 blocks ac-feature-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