{"id":"CVE-2026-109463","kind":"vulnerability","aliases":["CVE-2026-109463"],"related":[],"title":"Windows DNS: untrusted data deserialization lets a network attacker run code","description":"Deserialization of untrusted data in Windows DNS allows an unauthorized attacker to execute code over a network.","summary":"Windows DNS server mishandles deserialization of untrusted data, so an attacker can send crafted input over the network. A successful attack lets the attacker execute code on the server.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["dns","infrastructure","windows","windows-server"],"not_affected_if":["no-windows-dns-role"],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:15+00:00","first_seen_at":"2026-11-10T19:24:24+00:00","triaged_at":"2026-11-10T19:34:00+00:00","updated_at":"2026-11-10T19:34:00+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:34:00Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows DNS: untrusted data deserialization lets a network attacker run code","impact":"high","summary":"Windows DNS server mishandles deserialization of untrusted data, so an attacker can send crafted input over the network. A successful attack lets the attacker execute code on the server.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-server","dns"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"code runs on the DNS server over the network","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-109463 for affected Windows Server builds, default configuration, and the patch.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["no-windows-dns-role"],"who_is_affected":"Organizations running Windows Server with the DNS Server role are the ones exposed; the sources do not state affected builds or whether default configuration is vulnerable. Hosts that do not run the Windows DNS role are not affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.00066,"input_tokens":4488,"output_tokens":423,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-109463 for affected Windows Server builds, default configuration, and the patch.","search":"'-109463':14A,17A '-2026':13A,16A 'allow':60C 'attack':9A,34B,44B,47B,63C 'code':11A,49B,66C 'craft':37B 'cve':12A,15A 'data':4A,31B,56C 'deseri':5A,28B,53C 'dns':2A,18B,25B,59C 'execut':48B,65C 'infrastructur':19B 'input':38B 'let':6A,45B 'mishandl':27B 'network':8A,41B,69C 'run':10A 'send':36B 'server':23B,26B,52B 'success':43B 'unauthor':62C 'untrust':3A,30B,55C 'window':1A,20B,22B,24B,58C 'windows-serv':21B","nicknames":[],"mitigations":[],"who_affected":"Organizations running Windows Server with the DNS Server role are the ones exposed; the sources do not state affected builds or whether default configuration is vulnerable. Hosts that do not run the Windows DNS role are not affected.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["dns","high","infrastructure","windows","windowsserver"],"campaign_type":null,"search_a":"'-109463':14A,17A '-2026':13A,16A 'attack':9A 'code':11A 'cve':12A,15A 'data':4A 'deseri':5A 'dns':2A 'let':6A 'network':8A 'run':10A 'untrust':3A 'window':1A","search_b":"'attack':34B,44B,47B 'code':49B 'craft':37B 'data':31B 'deseri':28B 'dns':18B,25B 'execut':48B 'infrastructur':19B 'input':38B 'let':45B 'mishandl':27B 'network':41B 'send':36B 'server':23B,26B,52B 'success':43B 'untrust':30B 'window':20B,22B,24B 'windows-serv':21B","search_c":"'allow':60C 'attack':63C 'code':66C 'data':56C 'deseri':53C 'dns':59C 'execut':65C 'network':69C 'unauthor':62C 'untrust':55C 'window':58C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:15+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/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-2026-109463","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109463","severity":null,"published_at":"2026-11-10T19:18:15+00:00","modified_at":"2026-11-10T19:18:15+00:00","first_seen_at":"2026-11-10T19:24:24+00:00","fetched_at":"2026-11-10T19:24:24+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"}