npm · Malicious package advisory
Malware@denzz221/baileys
MAL-2026-18675
Malicious code in @denzz221/baileys (npm)
Details
@denzz221/baileys 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/newsletter.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363431475943819@newsletter (stored base64-encoded), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).
Compromised versions (11)
- 2.0.0
- 7.0.0
- 8.0.5
- 8.0.6
- 8.0.8
- 8.1.1
- 8.1.2
- 8.1.3
- 8.1.5
- 8.1.6
- 8.1.7
Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.