{"id":"CVE-2026-112970","kind":"vulnerability","aliases":["CVE-2026-112970"],"related":[],"title":"Windows SMB Client: use-after-free lets a local user gain higher privileges","description":"Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.","summary":"A use-after-free bug in the Windows SMB client lets an attacker who already has a local account raise their privileges. The attacker gets the rights of the system, which can mean full control of the machine.","severity":"high","cvss":7.0,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","smb","windows"],"not_affected_if":["non-windows-systems"],"how_to_check":"- Check the Windows build with `winver` or `systeminfo` and compare it against the update listed in the Microsoft advisory for CVE-2026-112970","fix":null,"status":"open","published_at":"2026-11-10T19:18:47+00:00","first_seen_at":"2026-11-10T19:24:35+00:00","triaged_at":"2026-11-10T19:53:31+00:00","updated_at":"2026-11-10T19:53:31+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:53:31Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows SMB Client: use-after-free lets a local user gain higher privileges","impact":"high","summary":"A use-after-free bug in the Windows SMB client lets an attacker who already has a local account raise their privileges. The attacker gets the rights of the system, which can mean full control of the machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","smb"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains system-level privileges on the Windows machine","analyst_note":"Find the Microsoft Security Update Guide entry for CVE-2026-112970 to confirm affected Windows builds and the fixed update.","how_to_check":"- Check the Windows build with `winver` or `systeminfo` and compare it against the update listed in the Microsoft advisory for CVE-2026-112970\n- unknown for other checks, as the sources do not say","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["non-windows-systems"],"who_is_affected":"Affects Windows machines where the SMB client is in use. The attacker must already be authorized to run code locally, so remote-only exposure is not indicated by the sources. unknown for further detail.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000687,"input_tokens":4478,"output_tokens":479,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft Security Update Guide entry for CVE-2026-112970 to confirm affected Windows builds and the fixed update.","search":"'-112970':17A,20A '-2026':16A,19A 'account':43B 'allow':70C 'alreadi':39B 'attack':37B,48B,73C 'author':72C 'bug':29B 'client':3A,34B,69C 'control':59B 'cve':15A,18A 'elev':75C 'free':7A,28B,65C 'full':58B 'gain':12A 'get':49B 'higher':13A 'infrastructur':21B 'let':8A,35B 'local':10A,42B,77C 'machin':62B 'mean':57B 'privileg':14A,46B,76C 'rais':44B 'right':51B 'smb':2A,22B,33B,68C 'system':54B 'use':5A,26B,63C 'use-after-fre':4A,25B 'user':11A 'window':1A,23B,32B,67C","nicknames":[],"mitigations":[],"who_affected":"Affects Windows machines where the SMB client is in use. The attacker must already be authorized to run code locally, so remote-only exposure is not indicated by the sources. unknown for further detail.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","smb","windows"],"campaign_type":null,"search_a":"'-112970':17A,20A '-2026':16A,19A 'client':3A 'cve':15A,18A 'free':7A 'gain':12A 'higher':13A 'let':8A 'local':10A 'privileg':14A 'smb':2A 'use':5A 'use-after-fre':4A 'user':11A 'window':1A","search_b":"'account':43B 'alreadi':39B 'attack':37B,48B 'bug':29B 'client':34B 'control':59B 'free':28B 'full':58B 'get':49B 'infrastructur':21B 'let':35B 'local':42B 'machin':62B 'mean':57B 'privileg':46B 'rais':44B 'right':51B 'smb':22B,33B 'system':54B 'use':26B 'use-after-fre':25B 'window':23B,32B","search_c":"'allow':70C 'attack':73C 'author':72C 'client':69C 'elev':75C 'free':65C 'local':77C 'privileg':76C 'smb':68C 'use':63C 'window':67C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:47+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-112970","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112970","severity":null,"published_at":"2026-11-10T19:18:47+00:00","modified_at":"2026-11-10T19:18:47+00:00","first_seen_at":"2026-11-10T19:24:35+00:00","fetched_at":"2026-11-10T19:24:35+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"}