{"id":"CVE-2026-105512","kind":"vulnerability","aliases":["CVE-2026-105512"],"related":[],"title":"Microsoft QUIC: integer underflow lets a network attacker crash service","description":"Integer underflow (wrap or wraparound) in Microsoft QUIC allows an unauthorized attacker to deny service over a network.","summary":"Microsoft QUIC, the transport layer used by Windows networking and related services, has an integer underflow bug. An unauthenticated attacker over the network can cause a denial of service.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft QUIC","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["infrastructure","microsoft-quic","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:17:50+00:00","first_seen_at":"2026-11-10T19:24:17+00:00","triaged_at":"2026-11-10T19:47:32+00:00","updated_at":"2026-11-10T19:47:32+00:00","category":"infrastructure","confidence":0.4,"triage":{"at":"2026-11-10T19:47:32Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft QUIC: integer underflow lets a network attacker crash service","impact":"low","summary":"Microsoft QUIC, the transport layer used by Windows networking and related services, has an integer underflow bug. An unauthenticated attacker over the network can cause a denial of service.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["microsoft-quic","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"Service becomes unavailable to network clients through denial of service","analyst_note":"Find the Microsoft advisory for CVE-2026-105512 to confirm affected Windows versions, patched builds and any setting that disables QUIC.","how_to_check":"unknown","plain_action":"","product_name":"Microsoft QUIC","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000642,"input_tokens":4504,"output_tokens":383,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft advisory for CVE-2026-105512 to confirm affected Windows versions, patched builds and any setting that disables QUIC.","search":"'-105512':13A,16A '-2026':12A,15A 'allow':61C 'attack':8A,43B,64C 'bug':40B 'caus':48B 'crash':9A 'cve':11A,14A 'deni':66C 'denial':50B 'infrastructur':19B 'integ':3A,38B,53C 'layer':28B 'let':5A 'microsoft':1A,17A,21B,24B,59C 'microsoft-qu':20B 'network':7A,32B,46B,70C 'quic':2A,18A,22B,25B,60C 'relat':34B 'servic':10A,35B,52B,67C 'transport':27B 'unauthent':42B 'unauthor':63C 'underflow':4A,39B,54C 'use':29B 'window':23B,31B 'wrap':55C 'wraparound':57C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["microsoftquic","quic"],"ptokens":["microsoft","quic"],"labels":["high","infrastructure","microsoftquic","vendor","windows"],"campaign_type":null,"search_a":"'-105512':13A,16A '-2026':12A,15A 'attack':8A 'crash':9A 'cve':11A,14A 'integ':3A 'let':5A 'microsoft':1A,17A 'network':7A 'quic':2A,18A 'servic':10A 'underflow':4A","search_b":"'attack':43B 'bug':40B 'caus':48B 'denial':50B 'infrastructur':19B 'integ':38B 'layer':28B 'microsoft':21B,24B 'microsoft-qu':20B 'network':32B,46B 'quic':22B,25B 'relat':34B 'servic':35B,52B 'transport':27B 'unauthent':42B 'underflow':39B 'use':29B 'window':23B,31B","search_c":"'allow':61C 'attack':64C 'deni':66C 'integ':53C 'microsoft':59C 'network':70C 'quic':60C 'servic':67C 'unauthor':63C 'underflow':54C 'wrap':55C 'wraparound':57C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:17:50+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-105512","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105512","severity":null,"published_at":"2026-11-10T19:17:50+00:00","modified_at":"2026-11-10T19:17:50+00:00","first_seen_at":"2026-11-10T19:24:17+00:00","fetched_at":"2026-11-10T19:24:17+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"}