{"id":"CVE-2026-121678","kind":"vulnerability","aliases":["CVE-2026-121678"],"related":[],"title":"Windows Remote Desktop Client: out-of-bounds read leaks memory over the network","description":"Out-of-bounds read in Remote Desktop Client allows an unauthorized attacker to disclose information over a network.","summary":"A flaw in the Remote Desktop Client reads memory past the end of a buffer when it handles network data. An unauthorized attacker on the network can use it to disclose information.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Remote Desktop Client","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["other","remote-desktop","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:20:31+00:00","first_seen_at":"2026-11-10T19:25:09+00:00","triaged_at":"2026-11-10T20:02:25+00:00","updated_at":"2026-11-10T20:02:25+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-10T20:02:25Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows Remote Desktop Client: out-of-bounds read leaks memory over the network","impact":"low","summary":"A flaw in the Remote Desktop Client reads memory past the end of a buffer when it handles network data. An unauthorized attacker on the network can use it to disclose information.","audience":"businesses","category":"other","nicknames":[],"who_cares":["windows","remote-desktop"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"attacker reads some memory contents from the client over the network","analyst_note":"Confirm the affected Windows or RDP client builds and the Microsoft advisory for CVE-2026-121678 at https://nvd.nist.gov/vuln/detail/CVE-2026-121678, then find the fixed versions and how to check them.","how_to_check":"unknown","plain_action":"","product_name":"Remote Desktop Client","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000655,"input_tokens":4493,"output_tokens":412,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-121678':17A,20A '-2026':16A,19A 'allow':70C 'attack':51B,73C 'bound':8A,64C 'buffer':43B 'client':4A,23A,35B,69C 'cve':15A,18A 'data':48B 'desktop':3A,22A,27B,34B,68C 'disclos':59B,75C 'end':40B 'flaw':30B 'handl':46B 'inform':60B,76C 'leak':10A 'memori':11A,37B 'network':14A,47B,54B,79C 'out-of-bound':5A,61C 'past':38B 'read':9A,36B,65C 'remot':2A,26B,33B,67C 'remote':21A 'remote-desktop':25B 'unauthor':50B,72C 'use':56B 'window':1A,28B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["desktopclient","remotedesktopclient"],"ptokens":["client","desktop","remote"],"labels":["medium","other","remotedesktop","vendor","windows"],"campaign_type":null,"search_a":"'-121678':17A,20A '-2026':16A,19A 'bound':8A 'client':4A,23A 'cve':15A,18A 'desktop':3A,22A 'leak':10A 'memori':11A 'network':14A 'out-of-bound':5A 'read':9A 'remot':2A 'remote':21A 'window':1A","search_b":"'attack':51B 'buffer':43B 'client':35B 'data':48B 'desktop':27B,34B 'disclos':59B 'end':40B 'flaw':30B 'handl':46B 'inform':60B 'memori':37B 'network':47B,54B 'past':38B 'read':36B 'remot':26B,33B 'remote-desktop':25B 'unauthor':50B 'use':56B 'window':28B","search_c":"'allow':70C 'attack':73C 'bound':64C 'client':69C 'desktop':68C 'disclos':75C 'inform':76C 'network':79C 'out-of-bound':61C 'read':65C 'remot':67C 'unauthor':72C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:31+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121678","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121678","severity":null,"published_at":"2026-11-10T19:20:31+00:00","modified_at":"2026-11-10T19:20:31+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"}