Which versions of async-mutex-hook are malicious?

The following npm versions of async-mutex-hook are flagged malicious: 2.1.0. Treat any of these as compromised.

How do I remediate async-mutex-hook if I installed it?

async-mutex-hook 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 async-mutex-hook — how do I know if it already compromised me?

If async-mutex-hook 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 async-mutex-hook part of a known attack campaign?

Yes — async-mutex-hook is associated with the IN-MAL-2026-014760, RLMA-2026-10693 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 async-mutex-hook across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for async-mutex-hook (version 2.1.0).

Malicious package

async-mutex-hooknpm

Advisory published Aug 5, 2026Updated Sep 24, 2026

async-mutex-hook is a confirmed malicious npm package (MAL-2026-12339) that steals credentials and exfiltrates sensitive data (malicious version 2.1.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in async-mutex-hook (npm)

MAL-2026-12339

Immediate action

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

npm uninstall async-mutex-hook

What this malware does

Package is published under the name async-mutex-hook and self-describes as a Promise-based mutex library, but ships no mutex implementation. Its exported getPlugin function issues an HTTPS request to the hardcoded bare-IP endpoint https://46.183.25.232:45000/icons/108 and passes the response's credits field to new Function('require','module','exports',...,'Promise', data.credits), executing attacker-controlled JavaScript with full Node.js privileges (require, process, Buffer, and shipped dependencies injected). The declared dependencies (@primno/dpapi for Windows DPAPI, better-sqlite3/sqlite3 for browser cookie and login databases, node-machine-id) are unrelated to any mutex functionality and are the standard building blocks for browser-credential and DPAPI theft, matching the capability the remote payload would need to invoke on the installer's host.

Malicious versions

1 flagged

2.1.0

Indicators of compromise (SHA-256)

624c93cbd007656467757c5504db29971b220bc36685eda2af6a1d1390715133

ab11430d779271b5e2bfe20997073cdfb6a4d6712b175d69b36c22ce57826840

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for async-mutex-hook (version 2.1.0).
If you installed it — respond
async-mutex-hook 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 async-mutex-hook 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. async-mutex-hook on npm has been identified as a malicious package (version 2.1.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-014760RLMA-2026-10693

References

npmjs.com

Credits

Amazon Inspector · finder
ReversingLabs · finder

Detect & block this

O3 blocks async-mutex-hook-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

All malware advisories How O3 detects malware Vulnerability database