How do I remediate @yemo-dev/yebail if I installed it?

Remove @yemo-dev/yebail 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 @yemo-dev/yebail — how do I know if it already compromised me?

If @yemo-dev/yebail 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 @yemo-dev/yebail across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for @yemo-dev/yebail (44 malicious versions).

Malicious package

@yemo-dev/yebailnpm

Advisory published Oct 27, 2026Updated Nov 9, 2026

@yemo-dev/yebail is a confirmed malicious npm package (MAL-2026-18919) that executes malicious code on install (malicious versions 1.0.0, 1.0.1, 1.1.0…). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @yemo-dev/yebail (npm)

MAL-2026-18919

Immediate action

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

npm uninstall @yemo-dev/yebail

What this malware does

@yemo-dev/yebail 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/messages-recv.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363408975923153@newsletter, 120363421171049265@newsletter (stored as character-code arrays), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).

Malicious versions

44 flagged

1.0.01.0.11.1.01.1.11.1.21.1.31.1.41.2.01.2.12.0.02.0.12.0.23.0.13.0.23.0.33.0.43.0.53.0.64.0.04.0.14.0.24.0.34.0.44.0.54.1.04.1.14.1.24.1.34.1.44.1.54.1.64.2.04.2.14.2.24.2.34.2.44.2.54.2.64.2.74.2.84.2.94.2.104.2.114.2.12

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for @yemo-dev/yebail (44 malicious versions).
If you installed it — respond
Remove @yemo-dev/yebail 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 @yemo-dev/yebail 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. @yemo-dev/yebail on npm has been identified as a malicious package (versions 1.0.0, 1.0.1, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.2.0, and 36 more 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 @yemo-dev/yebail-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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