3-buildsight-webnpm
Advisory published Updated
3-buildsight-web is a confirmed malicious npm package (MAL-2026-14364) that executes malicious code on install (malicious versions 1.0.0, 1.0.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in 3-buildsight-web (npm)
What this malware does
The package's main entry contains a top-level IIFE that runs on module load and fetches content from a hardcoded Bitbucket raw URL, https://bitbucket.org/p2p-alt-public/p2p-emis/raw/main/GameWebSight, on the mutable main branch. The parsed HTML is injected into the DOM and <script> nodes are re-created and appended to document.body, causing the remote JavaScript to execute in the consuming page's context. The reference is unpinned (no commit hash, tag, or integrity check), and the Bitbucket workspace (p2p-alt-public) is not aligned with any recognizable publisher. Whoever controls that branch can substitute arbitrary JavaScript at any time; each load of any application that imports this package will execute whatever bytes the branch currently serves, with the full privileges of that page.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for 3-buildsight-web (2 malicious versions).
If you installed it — respond
Remove 3-buildsight-web 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 3-buildsight-web 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
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks 3-buildsight-web-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.