loader-utils-kitnpm
Advisory published Updated
loader-utils-kit is a confirmed malicious npm package (MAL-2026-18689) that executes malicious code on install (malicious versions 4.2.1, 4.3.5). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in loader-utils-kit (npm)
What this malware does
loader-utils-kit ships lib/contract.js, byte-identical to the pino-testkit payload: an obfuscated module that decodes and evaluates code at load. It is a new name for the pino-testkit (MAL-2026-16484) campaign; the file hashes below match that record's evidence. The package presents itself as an ordinary utility, so the code runs on import or install without the user knowing.
Malicious versions
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for loader-utils-kit (2 malicious versions).
If you installed it — respond
Remove loader-utils-kit 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 loader-utils-kit 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
References
Credits
- CyberXYZ · finder
Detect & block this
O3 blocks loader-utils-kit-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.