---
id: "MAL-2026-18671"
kind: "package"
aliases: ["MAL-2026-18671"]
title: "Malicious code in @bellaxchan/bailtech (npm)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "@bellaxchan/bailtech", "fixed": [], "affected": "= 1.1.0", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-10-26T00:00:00+00:00"
first_seen_at: "2026-11-05T06:31:44+00:00"
updated_at: "2026-11-05T06:32:52+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-18671", "first_seen_at": "2026-11-05T06:31:44+00:00"}]
exploit_sources: []
---

# Malicious code in @bellaxchan/bailtech (npm)

## Affected

- npm:@bellaxchan/bailtech affected = 1.1.0 fixed no fixed version listed

## Timeline

- 2026-11-05T06:31:44+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-18671

## From the sources

@bellaxchan/bailtech 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).

---

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