{"id":"MAL-2026-19050","summary":"Malicious code in zyleys (npm)","details":"zyleys 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) 120363367153552860@newsletter, 120363368585140499@newsletter, 120363422814525873@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","modified":"2026-11-09T23:15:38.657042262Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"urls":[],"domains":[],"files":[{"digests":{"sha256":"25ca3312610fb035681cbbb2bfaf03353bf43e789cab424ac0aa8017089fe82f"},"paths":["lib/Socket/newsletter.js"]}],"ips":[]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/zyleys"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"zyleys","ecosystem":"npm","purl":"pkg:npm/zyleys"},"versions":["1.0.0"],"database_specific":{"cwes":[{"name":"Embedded Malicious Code","cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature."}],"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/zyleys/MAL-2026-19050.json"}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}