bug-monoreponpm
Advisory published Updated
bug-monorepo is a confirmed malicious npm package (MAL-2026-6349) that executes malicious code on install (malicious version 3.1.94). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in bug-monorepo (npm)
What this malware does
package.json declares preinstall: node index.js, causing index.js to run automatically on npm install. The script collects hostname, username, home directory, DNS servers, and the full package.json, and reads /etc/passwd and /etc/hosts (index.js:18), then HTTPS-POSTs the JSON payload to cp5uzinglyy3ifb8gvvgvq5qvh19p0dp.oastify.com (a Burp Collaborator out-of-band subdomain controlled by the attacker). Empty author/description fields and the generic bug-monorepo name are consistent with a dependency-confusion recon package targeting an internal namespace. Installing this package leaks host identity and sensitive system file contents to an attacker-controlled endpoint.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for bug-monorepo (version 3.1.94).
If you installed it — respond
Remove bug-monorepo 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 bug-monorepo 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 bug-monorepo-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.