What does the teaser-nav malware do?

The package teaser-nav was found to contain malicious code. The OpenSSF Package Analysis project identified 'teaser-nav' @ 19.9.5 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity. - The package executes one or more commands associated with malicious behavior.

Which versions of teaser-nav are malicious?

The following npm versions of teaser-nav are flagged malicious: 19.9.5, 99.1.1. Treat any of these as compromised.

How do I remediate teaser-nav if I installed it?

Remove teaser-nav 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 teaser-nav — how do I know if it already compromised me?

If teaser-nav 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 teaser-nav across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for teaser-nav (2 malicious versions).

Malicious package

teaser-navnpm

Advisory published Jan 31, 2026Updated Apr 17, 2026

teaser-nav is a confirmed malicious npm package (MAL-2026-615) that executes malicious code on install (malicious versions 19.9.5, 99.1.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in teaser-nav (npm)

MAL-2026-615

Immediate action

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

npm uninstall teaser-nav

What this malware does

The package teaser-nav was found to contain malicious code.

The OpenSSF Package Analysis project identified 'teaser-nav' @ 19.9.5 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.
The package executes one or more commands associated with malicious behavior.

Malicious versions

2 flagged

19.9.599.1.1

Indicators of compromise (SHA-256)

a69a1eb66a07b01f32627423563ed7bc97bc812e3200683025443248488be970

ebbd539070b3d1fb400c41280034565422204c7bf4047b965f596d56245c345e

91b4885b1f71547f011bf3e314dda5939bc8e8d1162630041f540aa18fc06c37

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for teaser-nav (2 malicious versions).
If you installed it — respond
Remove teaser-nav 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 teaser-nav 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. teaser-nav on npm has been identified as a malicious package (versions 19.9.5, 99.1.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

Amazon Inspector · finder
OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks teaser-nav-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