{"id":"MAL-2026-18998","kind":"package","aliases":["MAL-2026-18998"],"related":[],"title":"Malicious code in nyttt-baileys (npm)","description":"nyttt-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 and then MUTE, so the channel goes unnoticed, for the channel ID(s) 120363421930637018@newsletter, 120363422166977077@newsletter, 120363426326511354@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","summary":null,"severity":"critical","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"nyttt-baileys","fixed":[],"affected":"= 1.0.1","ecosystem":"npm"}],"ecosystems":["npm"],"tags":["malicious","package"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-27T00:00:00+00:00","first_seen_at":"2026-11-09T23:38:05+00:00","triaged_at":"2026-11-09T23:45:47+00:00","updated_at":"2026-11-09T23:45:47+00:00","category":"package","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'-17342':98C '-18998':10A,13A '-2026':9A,12A,97C '120363421930637018':74C '120363422166977077':76C '120363426326511354':78C 'account':39C 'authent':84C 'bailey':6A,21C,27C 'baileys':16A 'behaviour':91C 'channel':42C,66C,71C 'chosen':43C 'code':2A,51C 'connect':50C 'famili':95C 'follow':59C 'fork':24C 'goe':67C 'id':72C 'instal':35C 'lib/socket/newsletter.js':53C 'librari':30C 'mal':8A,11A,96C 'malici':1A,17B 'mex':58C 'mute':63C 'newslett':75C,77C,79C 'npm':7A 'nyttt':5A,15A,20C 'nyttt-bailey':4A,19C 'nyttt-baileys':14A 'packag':18B 'phantomsub':94C 'publish':46C 'queri':60C 'send':54C 'session':85C 'silent':32C 'socket':49C 'subscrib':33C 'tell':88C 'unnot':68C 'use':80C 'victim':82C 'w':57C 'web':29C 'whatsapp':28C,38C,41C,56C 'without':87C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"fix_status":null,"audience":null,"plain_action":null,"pkeys":["nytttbaileys"],"ptokens":["baileys","nyttt"],"labels":["critical","malicious","npm","package"],"campaign_type":null,"search_a":"'-18998':10A,13A '-2026':9A,12A 'bailey':6A 'baileys':16A 'code':2A 'mal':8A,11A 'malici':1A 'npm':7A 'nyttt':5A,15A 'nyttt-bailey':4A 'nyttt-baileys':14A","search_b":"'malici':17B 'packag':18B","search_c":"'-17342':98C '-2026':97C '120363421930637018':74C '120363422166977077':76C '120363426326511354':78C 'account':39C 'authent':84C 'bailey':21C,27C 'behaviour':91C 'channel':42C,66C,71C 'chosen':43C 'code':51C 'connect':50C 'famili':95C 'follow':59C 'fork':24C 'goe':67C 'id':72C 'instal':35C 'lib/socket/newsletter.js':53C 'librari':30C 'mal':96C 'mex':58C 'mute':63C 'newslett':75C,77C,79C 'nyttt':20C 'nyttt-bailey':19C 'phantomsub':94C 'publish':46C 'queri':60C 'send':54C 'session':85C 'silent':32C 'socket':49C 'subscrib':33C 'tell':88C 'unnot':68C 'use':80C 'victim':82C 'w':57C 'web':29C 'whatsapp':28C,38C,41C,56C 'without':87C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-10-27T00:00:00+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"osv-malicious","external_id":"MAL-2026-18998","url":"https://osv.dev/vulnerability/MAL-2026-18998","severity":"critical","published_at":"2026-10-27T00:00:00+00:00","modified_at":"2026-11-09T23:15:35+00:00","first_seen_at":"2026-11-09T23:38:05+00:00","fetched_at":"2026-11-09T23:38:05+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}