---
id: "MAL-2026-18919"
page: "https://infrastack.ai/live/MAL-2026-18919"
kind: "package"
aliases: ["MAL-2026-18919"]
title: "Malicious code in @yemo-dev/yebail (npm)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "@yemo-dev/yebail", "fixed": [], "affected": "= 1.0.0; = 1.0.1; = 1.1.0; = 1.1.1; = 1.1.2; = 1.1.3; = 1.1.4; = 1.2.0; = 1.2.1; = 2.0.0; = 2.0.1; = 2.0.2; = 3.0.1; = 3.0.2; = 3.0.3; = 3.0.4; = 3.0.5; = 3.0.6; = 4.0.0; = 4.0.1; = 4.0.2; = 4.0.3; = 4.0.4; = 4.0.5; = 4.1.0; = 4.1.1; = 4.1.2; = 4.1.3; = 4.1.4; = 4.1.5; = 4.1.6; = 4.2.0; = 4.2.1; = 4.2.10; = 4.2.11; = 4.2.12; = 4.2.2; = 4.2.3; = 4.2.4; = 4.2.5; = 4.2.6; = 4.2.7; = 4.2.8; = 4.2.9", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-10-27T00:00:00+00:00"
first_seen_at: "2026-11-09T23:38:01+00:00"
updated_at: "2026-11-09T23:43:42+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-18919", "first_seen_at": "2026-11-09T23:38:01+00:00"}]
exploit_sources: []
---

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

Link for people: https://infrastack.ai/live/MAL-2026-18919 (this .md is for agents)

## Affected

- npm:@yemo-dev/yebail affected = 1.0.0; = 1.0.1; = 1.1.0; = 1.1.1; = 1.1.2; = 1.1.3; = 1.1.4; = 1.2.0; = 1.2.1; = 2.0.0; = 2.0.1; = 2.0.2; = 3.0.1; = 3.0.2; = 3.0.3; = 3.0.4; = 3.0.5; = 3.0.6; = 4.0.0; = 4.0.1; = 4.0.2; = 4.0.3; = 4.0.4; = 4.0.5; = 4.1.0; = 4.1.1; = 4.1.2; = 4.1.3; = 4.1.4; = 4.1.5; = 4.1.6; = 4.2.0; = 4.2.1; = 4.2.10; = 4.2.11; = 4.2.12; = 4.2.2; = 4.2.3; = 4.2.4; = 4.2.5; = 4.2.6; = 4.2.7; = 4.2.8; = 4.2.9 fixed no fixed version listed

## Timeline

- 2026-11-09T23:38:01+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-18919

## From the sources

@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).

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