Which versions of jest-formatting are malicious?

The following npm versions of jest-formatting are flagged malicious: 9.9.2. Treat any of these as compromised.

How do I remediate jest-formatting if I installed it?

Remove jest-formatting 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 jest-formatting — how do I know if it already compromised me?

If jest-formatting 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 jest-formatting part of a known attack campaign?

Yes — jest-formatting is associated with the RLMA-2025-06370 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 jest-formatting across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for jest-formatting (version 9.9.2).

Malicious package

jest-formattingnpm

Advisory published Dec 23, 2025Updated Dec 24, 2025

jest-formatting is a confirmed malicious npm package (MAL-2025-192806) that executes malicious code on install (malicious version 9.9.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in jest-formatting (npm)

MAL-2025-192806

Immediate action

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

npm uninstall jest-formatting

What this malware does

The package jest-formatting was found to contain malicious code.

Malicious versions

1 flagged

9.9.2

Indicators of compromise (SHA-256)

47cda9632b29585b0832e2f456b53583a5559c00715b10c0aef187e06cb83d3b

3ee49a1ca7c2affe4868aff50e2e53335cb92e1c3cbd8727ecd7216e3eaf122a

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for jest-formatting (version 9.9.2).
If you installed it — respond
Remove jest-formatting 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 jest-formatting 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. jest-formatting on npm has been identified as a malicious package (version 9.9.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2025-06370

Credits

Amazon Inspector · finder
ReversingLabs · finder

Detect & block this

O3 blocks jest-formatting-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