{"id":"CVE-2026-109500","kind":"vulnerability","aliases":["CVE-2026-109500"],"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 unauthorized attacker run code over a network. The sources do not say which Word versions are affected or what the vendor fix is.","severity":"high","cvss":7.5,"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":"2026-11-10T19:18:19+00:00","first_seen_at":"2026-11-10T19:24:25+00:00","triaged_at":"2026-11-10T19:47:22+00:00","updated_at":"2026-11-10T19:47:22+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:47:22Z","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 unauthorized attacker run code over a network. The sources do not say which Word versions are affected or what the vendor fix is.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-office","word","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs code on the victim's machine over the network.","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-109500 for affected Office builds, patch availability and whether user interaction is required.","how_to_check":"- unknown","plain_action":"Update Microsoft Word through Microsoft's normal update channel once Microsoft releases a fix for CVE-2026-109500.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Anyone who opens Word documents on a machine running an affected version of Microsoft Office. The sources do not say whether the document must be opened by the user or whether a preview alone is enough. unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000679,"input_tokens":4494,"output_tokens":460,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-109500 for affected Office builds, patch availability and whether user interaction is required.","search":"'-109500':14A,17A '-2026':13A,16A 'affect':52B 'allow':67C 'attack':9A,37B,70C 'base':27B,60C 'buffer':4A,28B,61C 'code':11A,39B,73C 'cve':12A,15A 'execut':72C 'fix':57B 'heap':3A,26B,59C 'heap-bas':25B,58C 'let':6A,34B 'microsoft':1A,19B,31B,64C 'microsoft-offic':18B 'network':42B,76C 'offic':20B,32B,65C 'overflow':5A,29B,62C 'remot':8A 'run':10A,38B 'say':47B 'sourc':44B 'unauthor':36B,69C 'vendor':56B 'version':50B 'window':22B 'word':2A,23B,33B,49B,66C","nicknames":[],"mitigations":[],"who_affected":"Anyone who opens Word documents on a machine running an affected version of Microsoft Office. The sources do not say whether the document must be opened by the user or whether a preview alone is enough. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":"Update Microsoft Word through Microsoft's normal update channel once Microsoft releases a fix for CVE-2026-109500.","pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","other","windows","word"],"campaign_type":null,"search_a":"'-109500':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":"'affect':52B 'attack':37B 'base':27B 'buffer':28B 'code':39B 'fix':57B 'heap':26B 'heap-bas':25B 'let':34B 'microsoft':19B,31B 'microsoft-offic':18B 'network':42B 'offic':20B,32B 'overflow':29B 'run':38B 'say':47B 'sourc':44B 'unauthor':36B 'vendor':56B 'version':50B 'window':22B 'word':23B,33B,49B","search_c":"'allow':67C 'attack':70C 'base':60C 'buffer':61C 'code':73C 'execut':72C 'heap':59C 'heap-bas':58C 'microsoft':64C 'network':76C 'offic':65C 'overflow':62C 'unauthor':69C 'word':66C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:19+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/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-2026-109500","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109500","severity":null,"published_at":"2026-11-10T19:18:19+00:00","modified_at":"2026-11-10T19:18:19+00:00","first_seen_at":"2026-11-10T19:24:25+00:00","fetched_at":"2026-11-10T19:24:25+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"}