Which versions of @dxcl/user-js are malicious?

The following npm versions of @dxcl/user-js are flagged malicious: 99.99.99. Treat any of these as compromised.

How do I remediate @dxcl/user-js if I installed it?

Remove @dxcl/user-js 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 @dxcl/user-js — how do I know if it already compromised me?

If @dxcl/user-js 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 @dxcl/user-js part of a known attack campaign?

Yes — @dxcl/user-js is associated with the RLMA-2026-05420, RLUA-2026-05857 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 @dxcl/user-js across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for @dxcl/user-js (version 99.99.99).

Part of a larger attack: @dxcl published 8 malicious packages. See the full campaign →

Malicious package

@dxcl/user-jsnpm

Advisory published Jul 20, 2026Updated Sep 1, 2026

@dxcl/user-js is a confirmed malicious npm package (MAL-2026-10879) that executes malicious code on install (malicious version 99.99.99). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @dxcl/user-js (npm)

MAL-2026-10879

Immediate action

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

npm uninstall @dxcl/user-js

Malicious versions

1 flagged

99.99.99

Indicators of compromise (SHA-256)

c5a4fbba418f53913d8bd197bd4f44a7a4b3887e561e9c4f279cea3833762783

b3ceb33273b9c60466bc6fb6b4246ef50fd9cefe715c2b0f4586606eed1f550a

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for @dxcl/user-js (version 99.99.99).
If you installed it — respond
Remove @dxcl/user-js 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 @dxcl/user-js 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. @dxcl/user-js on npm has been identified as a malicious package (version 99.99.99 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-05420RLUA-2026-05857

References

github.com

Credits

ReversingLabs · finder

Detect & block this

O3 blocks @dxcl/user-js-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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