{"id":"CVE-2026-88236","kind":"vulnerability","aliases":["CVE-2026-88236"],"related":[],"title":"Microsoft QUIC: null pointer dereference lets a network attacker crash service","description":"Null pointer dereference in Microsoft QUIC allows an unauthorized attacker to deny service over a network.","summary":"A null pointer dereference in Microsoft's QUIC protocol implementation can be triggered over the network by an unauthenticated attacker. The result is a denial of service, meaning the affected service crashes or stops responding.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft QUIC","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["msquic","quic","runtime","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:32+00:00","first_seen_at":"2026-11-10T19:25:20+00:00","triaged_at":"2026-11-10T19:42:55+00:00","updated_at":"2026-11-10T19:42:55+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T19:42:55Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft QUIC: null pointer dereference lets a network attacker crash service","impact":"low","summary":"A null pointer dereference in Microsoft's QUIC protocol implementation can be triggered over the network by an unauthenticated attacker. The result is a denial of service, meaning the affected service crashes or stops responding.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["windows","quic","msquic"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Remote crash of a QUIC-using service, causing denial of service","analyst_note":"Check the NVD entry and the Microsoft Security Response Center advisory for affected Windows versions, the fixed build, and whether QUIC is enabled by default.","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":0.000649,"input_tokens":4488,"output_tokens":400,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the NVD entry and the Microsoft Security Response Center advisory for affected Windows versions, the fixed build, and whether QUIC is enabled by default.","search":"'-2026':13A,16A '-88236':14A,17A 'affect':53B 'allow':65C 'attack':9A,43B,68C 'crash':10A,55B 'cve':12A,15A 'deni':70C 'denial':48B 'derefer':5A,27B,61C 'implement':33B 'let':6A 'mean':51B 'microsoft':1A,18A,29B,63C 'msquic':20B 'network':8A,39B,74C 'null':3A,25B,59C 'pointer':4A,26B,60C 'protocol':32B 'quic':2A,19A,21B,31B,64C 'respond':58B 'result':45B 'runtim':22B 'servic':11A,50B,54B,71C 'stop':57B 'trigger':36B 'unauthent':42B 'unauthor':67C 'window':23B","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","msquic","quic","runtime","vendor","windows"],"campaign_type":null,"search_a":"'-2026':13A,16A '-88236':14A,17A 'attack':9A 'crash':10A 'cve':12A,15A 'derefer':5A 'let':6A 'microsoft':1A,18A 'network':8A 'null':3A 'pointer':4A 'quic':2A,19A 'servic':11A","search_b":"'affect':53B 'attack':43B 'crash':55B 'denial':48B 'derefer':27B 'implement':33B 'mean':51B 'microsoft':29B 'msquic':20B 'network':39B 'null':25B 'pointer':26B 'protocol':32B 'quic':21B,31B 'respond':58B 'result':45B 'runtim':22B 'servic':50B,54B 'stop':57B 'trigger':36B 'unauthent':42B 'window':23B","search_c":"'allow':65C 'attack':68C 'deni':70C 'derefer':61C 'microsoft':63C 'network':74C 'null':59C 'pointer':60C 'quic':64C 'servic':71C 'unauthor':67C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:32+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-2026-88236","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88236","severity":null,"published_at":"2026-11-10T19:21:32+00:00","modified_at":"2026-11-10T19:21:32+00:00","first_seen_at":"2026-11-10T19:25:20+00:00","fetched_at":"2026-11-10T19:25:20+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"}