What does the react-hook-form-5 malware do?

The package react-hook-form-5 was found to contain malicious code. The OpenSSF Package Analysis project identified 'react-hook-form-5' @ 90.9.0 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity. - The package executes one or more commands associated with malicious behavior.

Which versions of react-hook-form-5 are malicious?

The following npm versions of react-hook-form-5 are flagged malicious: 90.9.0. Treat any of these as compromised.

How do I remediate react-hook-form-5 if I installed it?

Remove react-hook-form-5 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 react-hook-form-5 — how do I know if it already compromised me?

If react-hook-form-5 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.

How do I find react-hook-form-5 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for react-hook-form-5 (version 90.9.0).

Malicious package

react-hook-form-5npm

Advisory published Dec 7, 2025Updated Dec 10, 2025

react-hook-form-5 is a confirmed malicious npm package (MAL-2025-192366) that executes malicious code on install (malicious version 90.9.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in react-hook-form-5 (npm)

MAL-2025-192366

Immediate action

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

npm uninstall react-hook-form-5

What this malware does

The package react-hook-form-5 was found to contain malicious code.

The OpenSSF Package Analysis project identified 'react-hook-form-5' @ 90.9.0 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.
The package executes one or more commands associated with malicious behavior.

Malicious versions

1 flagged

90.9.0

Indicators of compromise (SHA-256)

16859ad1dd7dccbd28650fc9bcfb6adf8c12eb7ea09b4cf1bb3381532d3dcad1

f1aa38d2e5718b378c2958a34a971314652bafc4462818307ae8e36df83f6cc7

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for react-hook-form-5 (version 90.9.0).
If you installed it — respond
Remove react-hook-form-5 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 react-hook-form-5 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. react-hook-form-5 on npm has been identified as a malicious package (version 90.9.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

Amazon Inspector · finder
OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks react-hook-form-5-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