{"id":"MAL-2026-18971","summary":"Malicious code in fast-baileys (npm)","details":"fast-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 a list downloaded at runtime from https://dew-md-data.pages.dev/channel.json (the URL itself stored as base64 strings), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","modified":"2026-11-09T23:15:30.997899069Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"domains":["dew-md-data.pages.dev"],"files":[{"digests":{"sha256":"ea1a62e70faa58618f56b6a4483a40c0c91bb4cfc0162d3b9996ac5d2326f7d6"},"paths":["lib/Socket/newsletter.js"]}],"ips":[],"urls":["https://dew-md-data.pages.dev/channel.json"]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/fast-baileys"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"fast-baileys","ecosystem":"npm","purl":"pkg:npm/fast-baileys"},"versions":["2.0.6","2.0.7","2.0.8","2.0.9"],"database_specific":{"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/fast-baileys/MAL-2026-18971.json","cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}]}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}