Which versions of b20miner are malicious?

The following npm versions of b20miner are flagged malicious: 0.3.1. Treat any of these as compromised.

How do I remediate b20miner if I installed it?

b20miner hijacks resources to mine cryptocurrency. Remove it, check for abnormal CPU/GPU and cloud-cost spikes, and rotate any credentials exposed to the compromised process.

I already installed b20miner — how do I know if it already compromised me?

If b20miner 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 b20miner part of a known attack campaign?

Yes — b20miner is associated with the GHSA-fw7x-6chc-4244 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 b20miner across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for b20miner (version 0.3.1).

Malicious package

b20minernpm

Advisory published Oct 28, 2026Updated Oct 28, 2026

b20miner is a confirmed malicious npm package (MAL-2026-18365) that hijacks the host to mine cryptocurrency (malicious version 0.3.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in b20miner (npm)

MAL-2026-18365

Immediate action

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

npm uninstall b20miner

What this malware does

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

1 flagged

0.3.1

Indicators of compromise (SHA-256)

6d1526b3a34c5de37870045aff69b54eb4d28fd5d1dbfe04fe23c5e1d654bdc3

Detection & response playbook

Cryptominer

Find it
Search your lockfiles and build artifacts for b20miner (version 0.3.1).
If you installed it — respond
b20miner hijacks resources to mine cryptocurrency. Remove it, check for abnormal CPU/GPU and cloud-cost spikes, and rotate any credentials exposed to the compromised process.
Did it already run?
If b20miner 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. b20miner on npm has been identified as a malicious package (version 0.3.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GHSA-fw7x-6chc-4244

References

github.com

Detect & block this

O3 blocks b20miner-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the mining traffic and severs the channel.

Malware detection Runtime egress monitoring

Explore

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