Which versions of react-query-core-utils are malicious?

The following npm versions of react-query-core-utils are flagged malicious: 4.4.1, 4.4.2, 4.4.3, 4.4.4, 4.4.5, 4.4.6, 4.4.7, 4.4.8, 4.4.9, 4.5.1, 4.5.2, 4.5.3. Treat any of these as compromised.

How do I remediate react-query-core-utils if I installed it?

Remove react-query-core-utils 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-query-core-utils — how do I know if it already compromised me?

If react-query-core-utils 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-query-core-utils part of a known attack campaign?

Yes — react-query-core-utils is associated with the RLMA-2026-01534 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-query-core-utils across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for react-query-core-utils (12 malicious versions).

Malicious package

react-query-core-utilsnpm

Advisory published Mar 18, 2026Updated Mar 23, 2026

react-query-core-utils is a confirmed malicious npm package (MAL-2026-1837) that executes malicious code on install (malicious versions 4.4.1, 4.4.2, 4.4.3…). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in react-query-core-utils (npm)

MAL-2026-1837

Immediate action

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

npm uninstall react-query-core-utils

What this malware does

The package react-query-core-utils was found to contain malicious code.

Malicious versions

12 flagged

4.4.14.4.24.4.34.4.44.4.54.4.64.4.74.4.84.4.94.5.14.5.24.5.3

Indicators of compromise (SHA-256)

1a3e776ed61f53631d9afd989879908a13c099492da8d9ffd27a0b95f58fe81e

3bce94f40a0e1879b184cd9f5abb5f4850d66aa5705b231b41337c2e2e33a3de

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for react-query-core-utils (12 malicious versions).
If you installed it — respond
Remove react-query-core-utils 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-query-core-utils 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-query-core-utils on npm has been identified as a malicious package (versions 4.4.1, 4.4.2, 4.4.3, 4.4.4, 4.4.5, 4.4.6, 4.4.7, 4.4.8, and 4 more flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-01534

Credits

Amazon Inspector · finder
ReversingLabs · finder

Detect & block this

O3 blocks react-query-core-utils-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

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