{"id":"CVE-2026-122162","kind":"vulnerability","aliases":["CVE-2026-122162"],"related":[],"title":"Windows Update Stack: integer underflow lets a local user read information","description":"Integer underflow (wrap or wraparound) in Windows Update Stack allows an authorized attacker to disclose information locally.","summary":"An integer underflow in the Windows Update Stack lets an authorized local attacker disclose information. The sources give no further detail on what data is exposed.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Windows Update Stack","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["infrastructure","windows"],"not_affected_if":["unknown"],"how_to_check":"- Check the Windows build with `winver` and compare it against the Microsoft security update guide entry for CVE-2026-122162","fix":null,"status":"open","published_at":"2026-11-10T19:20:32+00:00","first_seen_at":"2026-11-10T19:25:09+00:00","triaged_at":"2026-11-10T20:00:38+00:00","updated_at":"2026-11-10T20:00:38+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T20:00:38Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Update Stack: integer underflow lets a local user read information","impact":"low","summary":"An integer underflow in the Windows Update Stack lets an authorized local attacker disclose information. The sources give no further detail on what data is exposed.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local attacker reads information from the Windows Update component","analyst_note":"Find the Microsoft Security Update Guide entry for CVE-2026-122162 to confirm affected builds, the fixed update, and the data disclosed.","how_to_check":"- Check the Windows build with `winver` and compare it against the Microsoft security update guide entry for CVE-2026-122162\n- unknown","plain_action":"","product_name":"Windows Update Stack","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Windows machines with the Windows Update Stack component, where a logged-in user with some access could read information they should not see. The sources do not name affected builds or whether the flaw needs a particular configuration. Servers and workstations should both be checked against the vendor's advisory.","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000693,"input_tokens":4498,"output_tokens":486,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-122162':14A,17A '-2026':13A,16A 'allow':58C 'attack':35B,61C 'author':33B,60C 'cve':12A,15A 'data':46B 'detail':43B 'disclos':36B,63C 'expos':48B 'give':40B 'inform':11A,37B,64C 'infrastructur':21B 'integ':4A,24B,49C 'let':6A,31B 'local':8A,34B,65C 'read':10A 'sourc':39B 'stack':3A,20A,30B,57C 'underflow':5A,25B,50C 'updat':2A,29B,56C 'update':19A 'user':9A 'window':1A,22B,28B,55C 'windows':18A 'wrap':51C 'wraparound':53C","nicknames":[],"mitigations":[],"who_affected":"Windows machines with the Windows Update Stack component, where a logged-in user with some access could read information they should not see. The sources do not name affected builds or whether the flaw needs a particular configuration. Servers and workstations should both be checked against the vendor's advisory.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["updatestack","windowsupdatestack"],"ptokens":["stack","update","windows"],"labels":["infrastructure","medium","vendor","windows"],"campaign_type":null,"search_a":"'-122162':14A,17A '-2026':13A,16A 'cve':12A,15A 'inform':11A 'integ':4A 'let':6A 'local':8A 'read':10A 'stack':3A,20A 'underflow':5A 'updat':2A 'update':19A 'user':9A 'window':1A 'windows':18A","search_b":"'attack':35B 'author':33B 'data':46B 'detail':43B 'disclos':36B 'expos':48B 'give':40B 'inform':37B 'infrastructur':21B 'integ':24B 'let':31B 'local':34B 'sourc':39B 'stack':30B 'underflow':25B 'updat':29B 'window':22B,28B","search_c":"'allow':58C 'attack':61C 'author':60C 'disclos':63C 'inform':64C 'integ':49C 'local':65C 'stack':57C 'underflow':50C 'updat':56C 'window':55C 'wrap':51C 'wraparound':53C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:32+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-122162","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122162","severity":null,"published_at":"2026-11-10T19:20:32+00:00","modified_at":"2026-11-10T19:20:32+00:00","first_seen_at":"2026-11-10T19:25:09+00:00","fetched_at":"2026-11-10T19:25:09+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"}