{"id":"CVE-2026-112739","kind":"vulnerability","aliases":["CVE-2026-112739"],"related":[],"title":"Microsoft Word: heap buffer overflow lets a remote attacker run code","description":"Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","summary":"A heap-based buffer overflow in Microsoft Office Word lets an attacker send a crafted input that corrupts memory. The sources say an unauthorized attacker can execute code over a network.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["microsoft-office","other","windows","word"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:33+00:00","first_seen_at":"2026-11-10T19:24:31+00:00","triaged_at":"2026-11-10T19:31:51+00:00","updated_at":"2026-11-10T19:31:51+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-10T19:31:51Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: heap buffer overflow lets a remote attacker run code","impact":"high","summary":"A heap-based buffer overflow in Microsoft Office Word lets an attacker send a crafted input that corrupts memory. The sources say an unauthorized attacker can execute code over a network.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-office","word","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Attacker runs code on the victim's machine over the network","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-112739 for affected builds, fixed versions, and whether user interaction (opening a document) is required.","how_to_check":"- unknown","plain_action":"Update Microsoft Word to the latest version through Microsoft Update; the sources do not name a fixed version.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organizations and people running Microsoft Office Word are in scope; the sources do not list affected builds or versions. unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000668,"input_tokens":4494,"output_tokens":437,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-112739 for affected builds, fixed versions, and whether user interaction (opening a document) is required.","search":"'-112739':14A,17A '-2026':13A,16A 'allow':65C 'attack':9A,36B,49B,68C 'base':27B,58C 'buffer':4A,28B,59C 'code':11A,52B,71C 'corrupt':42B 'craft':39B 'cve':12A,15A 'execut':51B,70C 'heap':3A,26B,57C 'heap-bas':25B,56C 'input':40B 'let':6A,34B 'memori':43B 'microsoft':1A,19B,31B,62C 'microsoft-offic':18B 'network':55B,74C 'offic':20B,32B,63C 'overflow':5A,29B,60C 'remot':8A 'run':10A 'say':46B 'send':37B 'sourc':45B 'unauthor':48B,67C 'window':22B 'word':2A,23B,33B,64C","nicknames":[],"mitigations":[],"who_affected":"Organizations and people running Microsoft Office Word are in scope; the sources do not list affected builds or versions. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":"Update Microsoft Word to the latest version through Microsoft Update; the sources do not name a fixed version.","pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","other","windows","word"],"campaign_type":null,"search_a":"'-112739':14A,17A '-2026':13A,16A 'attack':9A 'buffer':4A 'code':11A 'cve':12A,15A 'heap':3A 'let':6A 'microsoft':1A 'overflow':5A 'remot':8A 'run':10A 'word':2A","search_b":"'attack':36B,49B 'base':27B 'buffer':28B 'code':52B 'corrupt':42B 'craft':39B 'execut':51B 'heap':26B 'heap-bas':25B 'input':40B 'let':34B 'memori':43B 'microsoft':19B,31B 'microsoft-offic':18B 'network':55B 'offic':20B,32B 'overflow':29B 'say':46B 'send':37B 'sourc':45B 'unauthor':48B 'window':22B 'word':23B,33B","search_c":"'allow':65C 'attack':68C 'base':58C 'buffer':59C 'code':71C 'execut':70C 'heap':57C 'heap-bas':56C 'microsoft':62C 'network':74C 'offic':63C 'overflow':60C 'unauthor':67C 'word':64C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:33+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-112739","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112739","severity":null,"published_at":"2026-11-10T19:18:33+00:00","modified_at":"2026-11-10T19:18:33+00:00","first_seen_at":"2026-11-10T19:24:31+00:00","fetched_at":"2026-11-10T19:24:31+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"}