{"id":"CVE-2026-109505","kind":"vulnerability","aliases":["CVE-2026-109505"],"related":[],"title":"Microsoft Word: stack buffer overflow lets an attacker run code remotely","description":"Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","summary":"A stack-based buffer overflow in Microsoft Office Word lets an unauthorized attacker reach the program over a network. The sources say that this can lead to running code on the victim's machine.","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":"2026-11-10T19:18:20+00:00","first_seen_at":"2026-11-10T19:24:26+00:00","triaged_at":"2026-11-10T19:32:38+00:00","updated_at":"2026-11-10T19:32:38+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:32:38Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: stack buffer overflow lets an attacker run code remotely","impact":"high","summary":"A stack-based buffer overflow in Microsoft Office Word lets an unauthorized attacker reach the program over a network. The sources say that this can lead to running code on the victim's machine.","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 computer over the network.","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-109505 for affected Word builds, the fixed build and whether user interaction (opening a file) is required.","how_to_check":"unknown","plain_action":"Update Microsoft Word through Microsoft's normal update channel once Microsoft releases a fix for CVE-2026-109505.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000653,"input_tokens":4494,"output_tokens":408,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-109505 for affected Word builds, the fixed build and whether user interaction (opening a file) is required.","search":"'-109505':14A,17A '-2026':13A,16A 'allow':68C 'attack':8A,37B,71C 'base':27B,61C 'buffer':4A,28B,62C 'code':10A,53B,74C 'cve':12A,15A 'execut':73C 'lead':50B 'let':6A,34B 'machin':58B 'microsoft':1A,19B,31B,65C 'microsoft-offic':18B 'network':43B,77C 'offic':20B,32B,66C 'overflow':5A,29B,63C 'program':40B 'reach':38B 'remot':11A 'run':9A,52B 'say':46B 'sourc':45B 'stack':3A,26B,60C 'stack-bas':25B,59C 'unauthor':36B,70C 'victim':56B 'window':22B 'word':2A,23B,33B,67C","nicknames":[],"mitigations":[],"who_affected":null,"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-2026-109505.","pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","other","windows","word"],"campaign_type":null,"search_a":"'-109505':14A,17A '-2026':13A,16A 'attack':8A 'buffer':4A 'code':10A 'cve':12A,15A 'let':6A 'microsoft':1A 'overflow':5A 'remot':11A 'run':9A 'stack':3A 'word':2A","search_b":"'attack':37B 'base':27B 'buffer':28B 'code':53B 'lead':50B 'let':34B 'machin':58B 'microsoft':19B,31B 'microsoft-offic':18B 'network':43B 'offic':20B,32B 'overflow':29B 'program':40B 'reach':38B 'run':52B 'say':46B 'sourc':45B 'stack':26B 'stack-bas':25B 'unauthor':36B 'victim':56B 'window':22B 'word':23B,33B","search_c":"'allow':68C 'attack':71C 'base':61C 'buffer':62C 'code':74C 'execut':73C 'microsoft':65C 'network':77C 'offic':66C 'overflow':63C 'stack':60C 'stack-bas':59C 'unauthor':70C 'word':67C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:20+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-2026-109505","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109505","severity":null,"published_at":"2026-11-10T19:18:20+00:00","modified_at":"2026-11-10T19:18:20+00:00","first_seen_at":"2026-11-10T19:24:26+00:00","fetched_at":"2026-11-10T19:24:26+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"}