classlinknpm
Advisory published Updated
classlink is a confirmed malicious npm package (MAL-2026-3049) that executes malicious code on install (malicious versions 2.0.0, 2.0.1, 2.0.2…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in classlink (npm)
What this malware does
The package classlink was found to contain malicious code.
The OpenSSF Package Analysis project identified 'classlink' @ 2.0.1 (npm) as malicious.
It is considered malicious because:
- The package communicates with a domain associated with malicious activity.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for classlink (4 malicious versions).
If you installed it — respond
Remove classlink 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 classlink 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 classlink-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.