{"id":"CVE-2026-112729","kind":"vulnerability","aliases":["CVE-2026-112729"],"related":[],"title":"Microsoft Word: heap buffer overflow lets a network 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 unauthorized attacker run code over a network. The sources give a CVSS score of 8.8 and do not describe the exact trigger.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Office Word","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["microsoft-office","other","windows","word"],"not_affected_if":[],"how_to_check":"- Check the installed Word version in File > Account > About Word, or confirm the Microsoft 365 update channel is current.","fix":null,"status":"open","published_at":"2026-11-10T19:18:31+00:00","first_seen_at":"2026-11-10T19:24:30+00:00","triaged_at":"2026-11-10T19:31:58+00:00","updated_at":"2026-11-10T19:31:58+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:31:58Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: heap buffer overflow lets a network attacker run code","impact":"high","summary":"A heap-based buffer overflow in Microsoft Office Word lets an unauthorized attacker run code over a network. The sources give a CVSS score of 8.8 and do not describe the exact trigger.","audience":"businesses","category":"other","nicknames":[],"who_cares":["microsoft-office","word","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Attacker runs code on the victim's machine over the network.","analyst_note":"Find the affected Word builds and Microsoft's fixed versions in the MSRC advisory for CVE-2026-112729, and whether opening a crafted file is needed.","how_to_check":"- Check the installed Word version in File > Account > About Word, or confirm the Microsoft 365 update channel is current.\n- unknown","plain_action":"","product_name":"Microsoft Office Word","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organizations running Microsoft Office Word on Windows or Mac. The sources do not say which Word versions or configurations are affected, or whether a user must open a document. unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000694,"input_tokens":4494,"output_tokens":490,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the affected Word builds and Microsoft's fixed versions in the MSRC advisory for CVE-2026-112729, and whether opening a crafted file is needed.","search":"'-112729':14A,17A '-2026':13A,16A '8.8':53B 'allow':70C 'attack':9A,40B,73C 'base':30B,63C 'buffer':4A,31B,64C 'code':11A,42B,76C 'cve':12A,15A 'cvss':50B 'describ':57B 'exact':59B 'execut':75C 'give':48B 'heap':3A,29B,62C 'heap-bas':28B,61C 'let':6A,37B 'microsoft':1A,18A,22B,34B,67C 'microsoft-offic':21B 'network':8A,45B,79C 'offic':23B,35B,68C 'office':19A 'overflow':5A,32B,65C 'run':10A,41B 'score':51B 'sourc':47B 'trigger':60B 'unauthor':39B,72C 'window':25B 'word':2A,20A,26B,36B,69C","nicknames":[],"mitigations":[],"who_affected":"Organizations running Microsoft Office Word on Windows or Mac. The sources do not say which Word versions or configurations are affected, or whether a user must open a document. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":["microsoftofficeword","officeword"],"ptokens":["microsoft","office","word"],"labels":["high","microsoftoffice","other","vendor","windows","word"],"campaign_type":null,"search_a":"'-112729':14A,17A '-2026':13A,16A 'attack':9A 'buffer':4A 'code':11A 'cve':12A,15A 'heap':3A 'let':6A 'microsoft':1A,18A 'network':8A 'office':19A 'overflow':5A 'run':10A 'word':2A,20A","search_b":"'8.8':53B 'attack':40B 'base':30B 'buffer':31B 'code':42B 'cvss':50B 'describ':57B 'exact':59B 'give':48B 'heap':29B 'heap-bas':28B 'let':37B 'microsoft':22B,34B 'microsoft-offic':21B 'network':45B 'offic':23B,35B 'overflow':32B 'run':41B 'score':51B 'sourc':47B 'trigger':60B 'unauthor':39B 'window':25B 'word':26B,36B","search_c":"'allow':70C 'attack':73C 'base':63C 'buffer':64C 'code':76C 'execut':75C 'heap':62C 'heap-bas':61C 'microsoft':67C 'network':79C 'offic':68C 'overflow':65C 'unauthor':72C 'word':69C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:31+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-2026-112729","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112729","severity":null,"published_at":"2026-11-10T19:18:31+00:00","modified_at":"2026-11-10T19:18:32+00:00","first_seen_at":"2026-11-10T19:24:30+00:00","fetched_at":"2026-11-10T19:24:30+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"}