{"id":"CVE-2026-119909","kind":"vulnerability","aliases":["CVE-2026-119909"],"related":[],"title":"Windows IIS: uncontrolled resource use lets an attacker cause denial of service","description":"Uncontrolled resource consumption in Windows Internet Information Services allows an unauthorized attacker to deny service over a network.","summary":"Microsoft Internet Information Services on Windows consumes resources without limit when handling certain requests. An unauthenticated attacker over the network can exhaust the server and make it unavailable.","severity":"medium","cvss":5.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["iis","infrastructure","self-hosted","windows"],"not_affected_if":["iis-not-installed"],"how_to_check":"- Check whether IIS is installed and running on the Windows server, for example with `Get-WindowsFeature Web-Server` in PowerShell.\n- Confirm the Windows build and installed updates against Microsoft's advisory for CVE-2026-119909: unknown from the sources.","fix":null,"status":"open","published_at":"2026-11-10T19:20:11+00:00","first_seen_at":"2026-11-10T19:25:02+00:00","triaged_at":"2026-11-10T20:00:02+00:00","updated_at":"2026-11-10T20:00:02+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T20:00:02Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows IIS: uncontrolled resource use lets an attacker cause denial of service","impact":"low","summary":"Microsoft Internet Information Services on Windows consumes resources without limit when handling certain requests. An unauthenticated attacker over the network can exhaust the server and make it unavailable.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["iis","windows","self-hosted"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Web server becomes unavailable to legitimate users","analyst_note":"Find Microsoft's advisory for CVE-2026-119909 to confirm affected IIS versions, fixed builds and any workaround.","how_to_check":"- Check whether IIS is installed and running on the Windows server, for example with `Get-WindowsFeature Web-Server` in PowerShell.\n- Confirm the Windows build and installed updates against Microsoft's advisory for CVE-2026-119909: unknown from the sources.","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["iis-not-installed"],"who_is_affected":"Servers running Microsoft Internet Information Services on Windows that accept network traffic are the exposed systems. The sources do not say which IIS versions or configurations are affected, so unknown.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000705,"input_tokens":4496,"output_tokens":510,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119909':15A,18A '-2026':14A,17A 'allow':61C 'attack':8A,41B,64C 'caus':9A 'certain':37B 'consum':31B 'consumpt':55C 'cve':13A,16A 'deni':66C 'denial':10A 'exhaust':46B 'handl':36B 'host':23B 'ii':2A,19B 'inform':27B,59C 'infrastructur':20B 'internet':26B,58C 'let':6A 'limit':34B 'make':50B 'microsoft':25B 'network':44B,70C 'request':38B 'resourc':4A,32B,54C 'self':22B 'self-host':21B 'server':48B 'servic':12A,28B,60C,67C 'unauthent':40B 'unauthor':63C 'unavail':52B 'uncontrol':3A,53C 'use':5A 'window':1A,24B,30B,57C 'without':33B","nicknames":[],"mitigations":[],"who_affected":"Servers running Microsoft Internet Information Services on Windows that accept network traffic are the exposed systems. The sources do not say which IIS versions or configurations are affected, so unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["iis","infrastructure","medium","selfhosted","windows"],"campaign_type":null,"search_a":"'-119909':15A,18A '-2026':14A,17A 'attack':8A 'caus':9A 'cve':13A,16A 'denial':10A 'ii':2A 'let':6A 'resourc':4A 'servic':12A 'uncontrol':3A 'use':5A 'window':1A","search_b":"'attack':41B 'certain':37B 'consum':31B 'exhaust':46B 'handl':36B 'host':23B 'ii':19B 'inform':27B 'infrastructur':20B 'internet':26B 'limit':34B 'make':50B 'microsoft':25B 'network':44B 'request':38B 'resourc':32B 'self':22B 'self-host':21B 'server':48B 'servic':28B 'unauthent':40B 'unavail':52B 'window':24B,30B 'without':33B","search_c":"'allow':61C 'attack':64C 'consumpt':55C 'deni':66C 'inform':59C 'internet':58C 'network':70C 'resourc':54C 'servic':60C,67C 'unauthor':63C 'uncontrol':53C 'window':57C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:11+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/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-2026-119909","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119909","severity":null,"published_at":"2026-11-10T19:20:11+00:00","modified_at":"2026-11-10T19:20:11+00:00","first_seen_at":"2026-11-10T19:25:02+00:00","fetched_at":"2026-11-10T19:25:02+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"}