Which versions of cowsay-caps are malicious?

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

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

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

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

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

Malicious package

cowsay-capsnpm

Advisory published Feb 2, 2026Updated Feb 2, 2026

cowsay-caps is a confirmed malicious npm package (MAL-2026-631) that executes malicious code on install. Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in cowsay-caps (npm)

MAL-2026-631

Immediate action

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

npm uninstall cowsay-caps

What this malware does

The package cowsay-caps 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)

17661a2b5a74d9c2f32dceee01043881ce230427c3121c4bdd6f43987e49765e

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for cowsay-caps (all published versions).
If you installed it — respond
Remove cowsay-caps 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-caps 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-caps 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-caps-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