{"id":"CVE-2026-111299","kind":"vulnerability","aliases":["CVE-2026-111299"],"related":[],"title":"Microsoft Word: heap buffer overflow lets an attacker run code over network","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 unauthenticated attacker run code on a victim's machine 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","microsoft-word","other","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:27+00:00","first_seen_at":"2026-11-10T19:24:29+00:00","triaged_at":"2026-11-10T19:32:17+00:00","updated_at":"2026-11-10T19:32:17+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:32:17Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Microsoft Word: heap buffer overflow lets an attacker run code over network","impact":"high","summary":"A heap-based buffer overflow in Microsoft Office Word lets an unauthenticated attacker run code on a victim's machine over a network. The sources give a CVSS score of 8.8 and do not describe the exact trigger.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-word","microsoft-office","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 Response Center advisory for CVE-2026-111299 for affected versions, the fixed build and whether user interaction (opening a document) is required.","how_to_check":"- unknown","plain_action":"Install the latest Microsoft Office and Word updates from Microsoft once they are released; the sources do not name a fixed version.","product_name":"Microsoft Office Word","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000674,"input_tokens":4494,"output_tokens":450,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-111299 for affected versions, the fixed build and whether user interaction (opening a document) is required.","search":"'-111299':15A,18A '-2026':14A,17A '8.8':61B 'allow':78C 'attack':8A,43B,81C 'base':33B,71C 'buffer':4A,34B,72C 'code':10A,45B,84C 'cve':13A,16A 'cvss':58B 'describ':65B 'exact':67B 'execut':83C 'give':56B 'heap':3A,32B,70C 'heap-bas':31B,69C 'let':6A,40B 'machin':50B 'microsoft':1A,19A,23B,26B,37B,75C 'microsoft-offic':22B 'microsoft-word':25B 'network':12A,53B,87C 'offic':24B,38B,76C 'office':20A 'overflow':5A,35B,73C 'run':9A,44B 'score':59B 'sourc':55B 'trigger':68B 'unauthent':42B 'unauthor':80C 'victim':48B 'window':29B 'word':2A,21A,27B,39B,77C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":"Install the latest Microsoft Office and Word updates from Microsoft once they are released; the sources do not name a fixed version.","pkeys":["microsoftofficeword","officeword"],"ptokens":["microsoft","office","word"],"labels":["high","microsoftoffice","microsoftword","other","vendor","windows"],"campaign_type":null,"search_a":"'-111299':15A,18A '-2026':14A,17A 'attack':8A 'buffer':4A 'code':10A 'cve':13A,16A 'heap':3A 'let':6A 'microsoft':1A,19A 'network':12A 'office':20A 'overflow':5A 'run':9A 'word':2A,21A","search_b":"'8.8':61B 'attack':43B 'base':33B 'buffer':34B 'code':45B 'cvss':58B 'describ':65B 'exact':67B 'give':56B 'heap':32B 'heap-bas':31B 'let':40B 'machin':50B 'microsoft':23B,26B,37B 'microsoft-offic':22B 'microsoft-word':25B 'network':53B 'offic':24B,38B 'overflow':35B 'run':44B 'score':59B 'sourc':55B 'trigger':68B 'unauthent':42B 'victim':48B 'window':29B 'word':27B,39B","search_c":"'allow':78C 'attack':81C 'base':71C 'buffer':72C 'code':84C 'execut':83C 'heap':70C 'heap-bas':69C 'microsoft':75C 'network':87C 'offic':76C 'overflow':73C 'unauthor':80C 'word':77C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:27+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-2026-111299","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111299","severity":null,"published_at":"2026-11-10T19:18:27+00:00","modified_at":"2026-11-10T19:18:27+00:00","first_seen_at":"2026-11-10T19:24:29+00:00","fetched_at":"2026-11-10T19:24:29+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"}