{"id":"CVE-2026-105551","kind":"vulnerability","aliases":["CVE-2026-105551"],"related":[],"title":"Windows NetBIOS: heap overflow lets a network attacker gain elevated privileges","description":"Heap-based buffer overflow in Windows NetBIOS allows an unauthorized attacker to elevate privileges over a network.","summary":"A heap-based buffer overflow in the Windows NetBIOS service lets an unauthenticated attacker over the network raise their privileges. The sources do not state which Windows versions are affected or what a full exploit chain requires.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","netbios","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:17:57+00:00","first_seen_at":"2026-11-10T19:24:19+00:00","triaged_at":"2026-11-10T19:47:30+00:00","updated_at":"2026-11-10T19:47:30+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T19:47:30Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows NetBIOS: heap overflow lets a network attacker gain elevated privileges","impact":"high","summary":"A heap-based buffer overflow in the Windows NetBIOS service lets an unauthenticated attacker over the network raise their privileges. The sources do not state which Windows versions are affected or what a full exploit chain requires.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","netbios"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"Network attacker gains elevated privileges on the Windows machine","analyst_note":"Find the Microsoft advisory for CVE-2026-105551 to confirm affected Windows builds, the fixed update, and whether NetBIOS is enabled by default.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000642,"input_tokens":4500,"output_tokens":383,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft advisory for CVE-2026-105551 to confirm affected Windows builds, the fixed update, and whether NetBIOS is enabled by default.","search":"'-105551':14A,17A '-2026':13A,16A 'affect':51B 'allow':67C 'attack':8A,35B,70C 'base':24B,61C 'buffer':25B,62C 'chain':57B 'cve':12A,15A 'elev':10A,72C 'exploit':56B 'full':55B 'gain':9A 'heap':3A,23B,60C 'heap-bas':22B,59C 'infrastructur':18B 'let':5A,32B 'netbio':2A,19B,30B,66C 'network':7A,38B,76C 'overflow':4A,26B,63C 'privileg':11A,41B,73C 'rais':39B 'requir':58B 'servic':31B 'sourc':43B 'state':46B 'unauthent':34B 'unauthor':69C 'version':49B 'window':1A,20B,29B,48B,65C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","netbios","windows"],"campaign_type":null,"search_a":"'-105551':14A,17A '-2026':13A,16A 'attack':8A 'cve':12A,15A 'elev':10A 'gain':9A 'heap':3A 'let':5A 'netbio':2A 'network':7A 'overflow':4A 'privileg':11A 'window':1A","search_b":"'affect':51B 'attack':35B 'base':24B 'buffer':25B 'chain':57B 'exploit':56B 'full':55B 'heap':23B 'heap-bas':22B 'infrastructur':18B 'let':32B 'netbio':19B,30B 'network':38B 'overflow':26B 'privileg':41B 'rais':39B 'requir':58B 'servic':31B 'sourc':43B 'state':46B 'unauthent':34B 'version':49B 'window':20B,29B,48B","search_c":"'allow':67C 'attack':70C 'base':61C 'buffer':62C 'elev':72C 'heap':60C 'heap-bas':59C 'netbio':66C 'network':76C 'overflow':63C 'privileg':73C 'unauthor':69C 'window':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:17:57+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-105551","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105551","severity":null,"published_at":"2026-11-10T19:17:57+00:00","modified_at":"2026-11-10T19:17:57+00:00","first_seen_at":"2026-11-10T19:24:19+00:00","fetched_at":"2026-11-10T19:24:19+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"}