What does the vfat-tools malware do?

The OpenSSF Package Analysis project identified 'vfat-tools' @ 2.0.0 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity.

Which versions of vfat-tools are malicious?

The following npm versions of vfat-tools are flagged malicious: 2.0.0. Treat any of these as compromised.

How do I remediate vfat-tools if I installed it?

Remove vfat-tools 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.

I already installed vfat-tools — how do I know if it already compromised me?

If vfat-tools 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.

How do I find vfat-tools across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for vfat-tools (version 2.0.0).

Malicious package

vfat-toolsnpm

Advisory published May 19, 2026Updated May 20, 2026

vfat-tools is a confirmed malicious npm package (MAL-2026-4179) that executes malicious code on install (malicious version 2.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in vfat-tools (npm)

MAL-2026-4179

Immediate action

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

npm uninstall vfat-tools

What this malware does

The OpenSSF Package Analysis project identified 'vfat-tools' @ 2.0.0 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.

Malicious versions

1 flagged

2.0.0

Indicators of compromise (SHA-256)

ee0462aa0f5350c9bd21ced3b826fd647a29c72be05f97f21df514c459cc775a

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for vfat-tools (version 2.0.0).
If you installed it — respond
Remove vfat-tools 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 vfat-tools 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. vfat-tools on npm has been identified as a malicious package (version 2.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks vfat-tools-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.

Malware detection Runtime egress monitoring

Explore

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