{"id":"MAL-2026-18812","summary":"Malicious code in @bufferstudio/baileys-natsu (npm)","details":"@bufferstudio/baileys-natsu 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/index.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363430188538810@newsletter (stored as base64 strings), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","modified":"2026-11-09T23:15:21.484851573Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"domains":[],"files":[{"digests":{"sha256":"1d45574bcb55c75a33a42e35c12ac83a85436a2dbe11815dac4c8563756443ed"},"paths":["lib/Socket/index.js"]}],"ips":[],"urls":[]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/@bufferstudio/baileys-natsu"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"@bufferstudio/baileys-natsu","ecosystem":"npm","purl":"pkg:npm/%40bufferstudio/baileys-natsu"},"versions":["1.2.2","1.2.3"],"database_specific":{"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@bufferstudio/baileys-natsu/MAL-2026-18812.json","cwes":[{"description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code","cweId":"CWE-506"}]}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}