{"id":"CVE-2026-118747","kind":"vulnerability","aliases":["CVE-2026-118747"],"related":[],"title":".NET: inefficient algorithm lets a network attacker cause denial of service","description":"Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.","summary":"Inefficient algorithmic complexity in .NET can be triggered by an unauthorized attacker over the network. An attacker can make the application consume excessive resources and stop responding.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["dotnet","runtime"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:51+00:00","first_seen_at":"2026-11-10T19:24:55+00:00","triaged_at":"2026-11-10T19:44:38+00:00","updated_at":"2026-11-10T19:44:38+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T19:44:38Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"internet","title":".NET: inefficient algorithm lets a network attacker cause denial of service","impact":"low","summary":"Inefficient algorithmic complexity in .NET can be triggered by an unauthorized attacker over the network. An attacker can make the application consume excessive resources and stop responding.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["dotnet"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"service becomes unresponsive under attacker-crafted network input","analyst_note":"Check the NVD entry and the .NET security advisories for affected versions, the triggering input, and the fixed release.","how_to_check":"unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000615,"input_tokens":4486,"output_tokens":333,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the NVD entry and the .NET security advisories for affected versions, the triggering input, and the fixed release.","search":"'-118747':14A,17A '-2026':13A,16A 'algorithm':3A,21B,48C 'allow':52C 'applic':40B 'attack':7A,31B,36B,55C 'caus':8A 'complex':22B,49C 'consum':41B 'cve':12A,15A 'deni':57C 'denial':9A 'dotnet':18B 'excess':42B 'ineffici':2A,20B,47C 'let':4A 'make':38B 'net':1A,24B,51C 'network':6A,34B,61C 'resourc':43B 'respond':46B 'runtim':19B 'servic':11A,58C 'stop':45B 'trigger':27B 'unauthor':30B,54C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["dotnet","high","runtime"],"campaign_type":null,"search_a":"'-118747':14A,17A '-2026':13A,16A 'algorithm':3A 'attack':7A 'caus':8A 'cve':12A,15A 'denial':9A 'ineffici':2A 'let':4A 'net':1A 'network':6A 'servic':11A","search_b":"'algorithm':21B 'applic':40B 'attack':31B,36B 'complex':22B 'consum':41B 'dotnet':18B 'excess':42B 'ineffici':20B 'make':38B 'net':24B 'network':34B 'resourc':43B 'respond':46B 'runtim':19B 'stop':45B 'trigger':27B 'unauthor':30B","search_c":"'algorithm':48C 'allow':52C 'attack':55C 'complex':49C 'deni':57C 'ineffici':47C 'net':51C 'network':61C 'servic':58C 'unauthor':54C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:51+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/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-2026-118747","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118747","severity":null,"published_at":"2026-11-10T19:19:51+00:00","modified_at":"2026-11-10T19:19:51+00:00","first_seen_at":"2026-11-10T19:24:55+00:00","fetched_at":"2026-11-10T19:24:55+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"}