Which versions of cowsay-fancy are malicious?

Every published version of cowsay-fancy on npm is considered malicious. Remove the package entirely.

How do I remediate cowsay-fancy if I installed it?

Remove cowsay-fancy 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 cowsay-fancy — how do I know if it already compromised me?

If cowsay-fancy 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 cowsay-fancy across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for cowsay-fancy (all published versions).

Malicious package

cowsay-fancynpm

Advisory published Feb 2, 2026Updated Feb 2, 2026

cowsay-fancy is a confirmed malicious npm package (MAL-2026-633) that executes malicious code on install. Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in cowsay-fancy (npm)

MAL-2026-633

Immediate action

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

npm uninstall cowsay-fancy

What this malware does

The package cowsay-fancy was found to contain malicious code.

Malicious versions

all versions

Every published version of this package is considered malicious — remove it entirely.

Indicators of compromise (SHA-256)

c0f9486b25540d8b6cc57f25e49747500f20e247fa207953354e74d2cc62fbfd

Detection & response playbook

Malicious package

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

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks cowsay-fancy-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

All malware advisories How O3 detects malware Vulnerability database