{"id":"MAL-2026-18684","kind":"package","aliases":["MAL-2026-18684"],"related":[],"title":"Malicious code in @zyrennofficiall/baileys (npm)","description":"@zyrennofficiall/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. A timer started when the socket connects, in lib/Socket/newsletter.js, sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363408893555851@newsletter, 120363426470081124@newsletter, 120363427718144294@newsletter (stored base64-encoded), using the victim's authenticated session and without telling them. This is separate from the update-channel follow the package announces in lib/Socket/index.js. Same behaviour as the PhantomSub family (MAL-2026-17342).","summary":null,"severity":"critical","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"@zyrennofficiall/baileys","fixed":[],"affected":"= 5.1.0; = 5.2.0; = 5.3.0; = 5.4.0; = 5.5.0","ecosystem":"npm"}],"ecosystems":["npm"],"tags":["malicious","package"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-26T00:00:00+00:00","first_seen_at":"2026-11-05T06:31:45+00:00","triaged_at":"2026-11-05T06:32:52+00:00","updated_at":"2026-11-05T06:32:52+00:00","category":"package","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'-17342':104C '-18684':8A,11A '-2026':7A,10A,103C '120363408893555851':62C '120363426470081124':64C '120363427718144294':66C 'account':33C 'announc':93C 'authent':76C 'bailey':21C 'base64':70C 'base64-encoded':69C 'behaviour':97C 'channel':36C,59C,89C 'chosen':37C 'code':2A 'connect':47C 'encod':71C 'famili':101C 'follow':55C,90C 'fork':18C 'id':60C 'instal':29C 'lib/socket/index.js':95C 'lib/socket/newsletter.js':49C 'librari':24C 'mal':6A,9A,102C 'malici':1A,13B 'mex':54C 'newslett':63C,65C,67C 'npm':5A 'packag':14B,92C 'phantomsub':100C 'publish':40C 'queri':56C 'send':50C 'separ':84C 'session':77C 'silent':26C 'socket':46C 'start':43C 'store':68C 'subscrib':27C 'tell':80C 'timer':42C 'updat':88C 'update-channel':87C 'use':72C 'victim':74C 'w':53C 'web':23C 'whatsapp':22C,32C,35C,52C 'without':79C 'zyrennofficiall/baileys':4A,12A,15C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"fix_status":null,"audience":null,"plain_action":null,"pkeys":["baileys"],"ptokens":["baileys","zyrennofficiall"],"labels":["critical","malicious","npm","package"],"campaign_type":null,"first_public_at":"2026-10-26T00:00:00+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"osv-malicious","external_id":"MAL-2026-18684","url":"https://osv.dev/vulnerability/MAL-2026-18684","severity":"critical","published_at":"2026-10-26T00:00:00+00:00","modified_at":"2026-11-05T05:15:05+00:00","first_seen_at":"2026-11-05T06:31:45+00:00","fetched_at":"2026-11-05T06:31:45+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}