Which versions of @bufferstudio/baileys-natsu are malicious?

The following npm versions of @bufferstudio/baileys-natsu are flagged malicious: 1.2.2, 1.2.3. Treat any of these as compromised.

How do I remediate @bufferstudio/baileys-natsu if I installed it?

Remove @bufferstudio/baileys-natsu 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 @bufferstudio/baileys-natsu — how do I know if it already compromised me?

If @bufferstudio/baileys-natsu 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 @bufferstudio/baileys-natsu across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for @bufferstudio/baileys-natsu (2 malicious versions).

Malicious package

@bufferstudio/baileys-natsunpm

Advisory published Oct 27, 2026Updated Nov 9, 2026

@bufferstudio/baileys-natsu is a confirmed malicious npm package (MAL-2026-18812) that executes malicious code on install (malicious versions 1.2.2, 1.2.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @bufferstudio/baileys-natsu (npm)

MAL-2026-18812

Immediate action

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

npm uninstall @bufferstudio/baileys-natsu

What this malware does

@bufferstudio/baileys-natsu is a fork of the Baileys WhatsApp Web library that silently subscribes the installer's own WhatsApp account to WhatsApp Channels chosen by the publisher. When the socket connects, code in lib/Socket/index.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363430188538810@newsletter (stored as base64 strings), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).

Malicious versions

2 flagged

1.2.21.2.3

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for @bufferstudio/baileys-natsu (2 malicious versions).
If you installed it — respond
Remove @bufferstudio/baileys-natsu 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 @bufferstudio/baileys-natsu 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. @bufferstudio/baileys-natsu on npm has been identified as a malicious package (versions 1.2.2, 1.2.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

References

Credits

CyberXYZ · finder

Detect & block this

O3 blocks @bufferstudio/baileys-natsu-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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