{"id":"CVE-2026-88220","kind":"vulnerability","aliases":["CVE-2026-88220"],"related":[],"title":"Windows Performance Counters: local over-read leaks memory to authorized users","description":"Buffer over-read in Windows Performance Counters allows an authorized attacker to disclose information locally.","summary":"A buffer over-read in the Windows Performance Counters component lets an authorized local user read memory they should not see. The attacker gets information disclosure on the same machine, not code execution.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:21:29+00:00","first_seen_at":"2026-11-10T19:25:19+00:00","triaged_at":"2026-11-10T20:00:31+00:00","updated_at":"2026-11-10T20:00:31+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T20:00:31Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Performance Counters: local over-read leaks memory to authorized users","impact":"low","summary":"A buffer over-read in the Windows Performance Counters component lets an authorized local user read memory they should not see. The attacker gets information disclosure on the same machine, not code execution.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user reads sensitive memory contents from the system","analyst_note":"Check the Microsoft security update guide entry for CVE-2026-88220 for affected Windows builds, the fixed build and the KB number.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Affects Windows systems where a local account with authorized access can use Performance Counters. The sources do not name affected Windows builds or whether a patch is out. Remote attackers without a local account are not described as affected.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000649,"input_tokens":4483,"output_tokens":402,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-88220':15A,18A 'allow':63C 'attack':44B,66C 'author':11A,34B,65C 'buffer':22B,55C 'code':53B 'compon':31B 'counter':3A,30B,62C 'cve':13A,16A 'disclos':68C 'disclosur':47B 'execut':54B 'get':45B 'inform':46B,69C 'infrastructur':19B 'leak':8A 'let':32B 'local':4A,35B,70C 'machin':51B 'memori':9A,38B 'over-read':5A,23B,56C 'perform':2A,29B,61C 'read':7A,25B,37B,58C 'see':42B 'user':12A,36B 'window':1A,20B,28B,60C","nicknames":[],"mitigations":[],"who_affected":"Affects Windows systems where a local account with authorized access can use Performance Counters. The sources do not name affected Windows builds or whether a patch is out. Remote attackers without a local account are not described as affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["infrastructure","medium","windows"],"campaign_type":null,"search_a":"'-2026':14A,17A '-88220':15A,18A 'author':11A 'counter':3A 'cve':13A,16A 'leak':8A 'local':4A 'memori':9A 'over-read':5A 'perform':2A 'read':7A 'user':12A 'window':1A","search_b":"'attack':44B 'author':34B 'buffer':22B 'code':53B 'compon':31B 'counter':30B 'disclosur':47B 'execut':54B 'get':45B 'inform':46B 'infrastructur':19B 'let':32B 'local':35B 'machin':51B 'memori':38B 'over-read':23B 'perform':29B 'read':25B,37B 'see':42B 'user':36B 'window':20B,28B","search_c":"'allow':63C 'attack':66C 'author':65C 'buffer':55C 'counter':62C 'disclos':68C 'inform':69C 'local':70C 'over-read':56C 'perform':61C 'read':58C 'window':60C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:29+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-2026-88220","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88220","severity":null,"published_at":"2026-11-10T19:21:29+00:00","modified_at":"2026-11-10T19:21:29+00:00","first_seen_at":"2026-11-10T19:25:19+00:00","fetched_at":"2026-11-10T19:25:19+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"}