---
id: "MAL-2026-19044"
page: "https://infrastack.ai/live/MAL-2026-19044"
kind: "package"
aliases: ["MAL-2026-19044"]
title: "Malicious code in yuuki-baileys (npm)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "yuuki-baileys", "fixed": [], "affected": "= 1.0.1; = 2.0.0; = 2.1.0", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-10-27T00:00:00+00:00"
first_seen_at: "2026-11-09T23:38:07+00:00"
updated_at: "2026-11-09T23:45:47+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-19044", "first_seen_at": "2026-11-09T23:38:07+00:00"}]
exploit_sources: []
---

# Malicious code in yuuki-baileys (npm)

Link for people: https://infrastack.ai/live/MAL-2026-19044 (this .md is for agents)

## Affected

- npm:yuuki-baileys affected = 1.0.1; = 2.0.0; = 2.1.0 fixed no fixed version listed

## Timeline

- 2026-11-09T23:38:07+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-19044

## From the sources

yuuki-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 Yuuki-baileys/lib/Socket/newsletter.js, lib/Socket/newsletter.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363406005175144@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_