Which versions of carbon-monorepo are malicious?

The following npm versions of carbon-monorepo are flagged malicious: 20.1.1. Treat any of these as compromised.

How do I remediate carbon-monorepo if I installed it?

carbon-monorepo 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 carbon-monorepo — how do I know if it already compromised me?

If carbon-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.

Is carbon-monorepo part of a known attack campaign?

Yes — carbon-monorepo is associated with the IN-MAL-2026-018329 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 carbon-monorepo across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for carbon-monorepo (version 20.1.1).

Malicious package

carbon-monoreponpm

carbon-monorepo is a confirmed malicious npm package (MAL-2026-14229) that steals credentials and exfiltrates sensitive data (malicious version 20.1.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in carbon-monorepo (npm)

MAL-2026-14229

Immediate action

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

npm uninstall carbon-monorepo

What this malware does

The package's package.json declares a postinstall hook that runs index.js on npm install. index.js collects host reconnaissance and installer secrets — os.hostname(), full process.env, platform/arch, cwd, package.json, node_modules listing, and the output of shell commands whoami/uname/id/cat /etc/passwd/cat /etc/shadow — and reads ~/.npmrc (which typically contains npm auth tokens) and recent ~/.npm/_logs. The collected data is POSTed over plain HTTP via http.request to the hardcoded host ywy8qnd4a931ga4v74k70b9g67c00qof.oastify.com, a Burp Collaborator (OAST) subdomain. Package metadata masquerades as an esbuild netbsd-x64 build ("description": "netbsd-x64 build for esbuild") but the tarball ships only the recon/exfil script, no build artifacts or library code — the sole install-time effect is running the exfiltration payload.

Malicious versions

1 flagged

20.1.1

Indicators of compromise (SHA-256)

9c617e93833344e13d376182fb00c13994a4d2e7f3f8220998e541d77a8e8713

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for carbon-monorepo (version 20.1.1).
If you installed it — respond
carbon-monorepo 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 carbon-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

No. carbon-monorepo on npm has been identified as a malicious package (version 20.1.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-018329

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks carbon-monorepo-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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