{"id":"CVE-2026-112721","kind":"vulnerability","aliases":["CVE-2026-112721"],"related":[],"title":"Microsoft Word: heap buffer overflow lets 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 unauthorized attacker run code over a network. The sources give no further detail on the trigger or the affected versions.","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":"2026-11-10T19:18:30+00:00","first_seen_at":"2026-11-10T19:24:30+00:00","triaged_at":"2026-11-10T19:32:03+00:00","updated_at":"2026-11-10T19:32:03+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-10T19:32:03Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: heap buffer overflow lets remote 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 no further detail on the trigger or the affected versions.","audience":"businesses","category":"other","nicknames":[],"who_cares":["microsoft-office","word","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs arbitrary code on the machine over the network","analyst_note":"Find the affected Word versions and Microsoft's security update guide entry for CVE-2026-112721 and whether user interaction is required.","how_to_check":"- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organisations that run Microsoft Office Word. The sources do not say which versions are affected or what user action is needed.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.00064,"input_tokens":4494,"output_tokens":382,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the affected Word versions and Microsoft's security update guide entry for CVE-2026-112721 and whether user interaction is required.","search":"'-112721':13A,16A '-2026':12A,15A 'affect':53B 'allow':64C 'attack':8A,36B,67C 'base':26B,57C 'buffer':4A,27B,58C 'code':10A,38B,70C 'cve':11A,14A 'detail':47B 'execut':69C 'give':44B 'heap':3A,25B,56C 'heap-bas':24B,55C 'let':6A,33B 'microsoft':1A,18B,30B,61C 'microsoft-offic':17B 'network':41B,73C 'offic':19B,31B,62C 'overflow':5A,28B,59C 'remot':7A 'run':9A,37B 'sourc':43B 'trigger':50B 'unauthor':35B,66C 'version':54B 'window':21B 'word':2A,22B,32B,63C","nicknames":[],"mitigations":[],"who_affected":"Organisations that run Microsoft Office Word. The sources do not say which versions are affected or what user action is needed.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","other","windows","word"],"campaign_type":null,"search_a":"'-112721':13A,16A '-2026':12A,15A 'attack':8A 'buffer':4A 'code':10A 'cve':11A,14A 'heap':3A 'let':6A 'microsoft':1A 'overflow':5A 'remot':7A 'run':9A 'word':2A","search_b":"'affect':53B 'attack':36B 'base':26B 'buffer':27B 'code':38B 'detail':47B 'give':44B 'heap':25B 'heap-bas':24B 'let':33B 'microsoft':18B,30B 'microsoft-offic':17B 'network':41B 'offic':19B,31B 'overflow':28B 'run':37B 'sourc':43B 'trigger':50B 'unauthor':35B 'version':54B 'window':21B 'word':22B,32B","search_c":"'allow':64C 'attack':67C 'base':57C 'buffer':58C 'code':70C 'execut':69C 'heap':56C 'heap-bas':55C 'microsoft':61C 'network':73C 'offic':62C 'overflow':59C 'unauthor':66C 'word':63C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:30+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-2026-112721","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112721","severity":null,"published_at":"2026-11-10T19:18:30+00:00","modified_at":"2026-11-10T19:18:30+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"}