oneblk-design-systemnpm
Advisory published Updated
oneblk-design-system is a confirmed malicious npm package (MAL-2026-3421) that executes malicious code on install (malicious version 99.99.99). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in oneblk-design-system (npm)
What this malware does
The package oneblk-design-system was found to contain malicious code.
The OpenSSF Package Analysis project identified 'oneblk-design-system' @ 99.99.99 (npm) as malicious.
It is considered malicious because:
- The package executes one or more commands associated with malicious behavior.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for oneblk-design-system (version 99.99.99).
If you installed it — respond
Remove oneblk-design-system 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 oneblk-design-system 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
Credits
- Amazon Inspector · finder
- OpenSSF: Package Analysis · finder
Detect & block this
O3 blocks oneblk-design-system-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.