{"id":"CVE-2026-112758","kind":"vulnerability","aliases":["CVE-2026-112758"],"related":[],"title":"Windows Defender Firewall Service: double free lets a local user gain privileges","description":"Double free in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally.","summary":"A double free bug in the Windows Defender Firewall Service lets an attacker who already has a local account raise their privileges. The sources give no further detail on the trigger or the affected Windows builds.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Windows Defender Firewall Service","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["infrastructure","windows","windows-defender-firewall"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:37+00:00","first_seen_at":"2026-11-10T19:24:32+00:00","triaged_at":"2026-11-10T19:42:20+00:00","updated_at":"2026-11-10T19:42:20+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-10T19:42:20Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Defender Firewall Service: double free lets a local user gain privileges","impact":"high","summary":"A double free bug in the Windows Defender Firewall Service lets an attacker who already has a local account raise their privileges. The sources give no further detail on the trigger or the affected Windows builds.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","windows-defender-firewall"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"local user gains SYSTEM-level privileges on the machine","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-112758 to get affected Windows builds, the fixed update, and the check method.","how_to_check":"unknown","plain_action":"","product_name":"Windows Defender Firewall Service","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Systems running the Windows Defender Firewall Service where an authorized local user could be an attacker; the sources do not list affected builds. unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000665,"input_tokens":4484,"output_tokens":433,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft security update guide entry for CVE-2026-112758 to get affected Windows builds, the fixed update, and the check method.","search":"'-112758':15A,18A '-2026':14A,17A 'account':47B 'affect':62B 'allow':72C 'alreadi':43B 'attack':41B,75C 'author':74C 'bug':32B 'build':64B 'cve':13A,16A 'defend':2A,27B,36B,69C 'defender':20A 'detail':56B 'doubl':5A,30B,65C 'elev':77C 'firewal':3A,28B,37B,70C 'firewall':21A 'free':6A,31B,66C 'gain':11A 'give':53B 'infrastructur':23B 'let':7A,39B 'local':9A,46B,79C 'privileg':12A,50B,78C 'rais':48B 'servic':4A,38B,71C 'service':22A 'sourc':52B 'trigger':59B 'user':10A 'window':1A,24B,26B,35B,63B,68C 'windows':19A 'windows-defender-firewal':25B","nicknames":[],"mitigations":[],"who_affected":"Systems running the Windows Defender Firewall Service where an authorized local user could be an attacker; the sources do not list affected builds. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["defenderfirewallservice","windowsdefenderfirewallservice"],"ptokens":["defender","firewall","service","windows"],"labels":["high","infrastructure","vendor","windows","windowsdefenderfirewall"],"campaign_type":null,"search_a":"'-112758':15A,18A '-2026':14A,17A 'cve':13A,16A 'defend':2A 'defender':20A 'doubl':5A 'firewal':3A 'firewall':21A 'free':6A 'gain':11A 'let':7A 'local':9A 'privileg':12A 'servic':4A 'service':22A 'user':10A 'window':1A 'windows':19A","search_b":"'account':47B 'affect':62B 'alreadi':43B 'attack':41B 'bug':32B 'build':64B 'defend':27B,36B 'detail':56B 'doubl':30B 'firewal':28B,37B 'free':31B 'give':53B 'infrastructur':23B 'let':39B 'local':46B 'privileg':50B 'rais':48B 'servic':38B 'sourc':52B 'trigger':59B 'window':24B,26B,35B,63B 'windows-defender-firewal':25B","search_c":"'allow':72C 'attack':75C 'author':74C 'defend':69C 'doubl':65C 'elev':77C 'firewal':70C 'free':66C 'local':79C 'privileg':78C 'servic':71C 'window':68C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:37+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/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-2026-112758","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112758","severity":null,"published_at":"2026-11-10T19:18:37+00:00","modified_at":"2026-11-10T19:18:37+00:00","first_seen_at":"2026-11-10T19:24:32+00:00","fetched_at":"2026-11-10T19:24:32+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"}