{"id":"CVE-2026-109491","kind":"vulnerability","aliases":["CVE-2026-109491"],"related":[],"title":"Microsoft Word: use-after-free lets a remote attacker run code","description":"Use after free in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","summary":"A use-after-free bug in Microsoft Office Word lets an unauthorized attacker run code over a network. The sources give a CVSS score of 7.5 and no fixed version.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Office Word","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["microsoft-office","package","word"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:18:17+00:00","first_seen_at":"2026-11-10T19:24:25+00:00","triaged_at":"2026-11-10T19:47:20+00:00","updated_at":"2026-11-10T19:47:20+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-11-10T19:47:20Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: use-after-free lets a remote attacker run code","impact":"high","summary":"A use-after-free bug in Microsoft Office Word lets an unauthorized attacker run code over a network. The sources give a CVSS score of 7.5 and no fixed version.","audience":"everyone","category":"package","nicknames":[],"who_cares":["microsoft-office","word"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"attacker runs code on the victim's computer over network","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-109491 for affected builds, patched versions, and whether user interaction (opening a document) is required.","how_to_check":"unknown","plain_action":"unknown","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":0.000639,"input_tokens":4480,"output_tokens":381,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-109491 for affected builds, patched versions, and whether user interaction (opening a document) is required.","search":"'-109491':15A,18A '-2026':14A,17A '7.5':53B 'allow':65C 'attack':10A,40B,68C 'bug':32B 'code':12A,42B,71C 'cve':13A,16A 'cvss':50B 'execut':70C 'fix':56B 'free':6A,31B,60C 'give':48B 'let':7A,37B 'microsoft':1A,19A,23B,34B,62C 'microsoft-offic':22B 'network':45B,74C 'offic':24B,35B,63C 'office':20A 'packag':25B 'remot':9A 'run':11A,41B 'score':51B 'sourc':47B 'unauthor':39B,67C 'use':4A,29B,58C 'use-after-fre':3A,28B 'version':57B 'word':2A,21A,26B,36B,64C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":null,"pkeys":["microsoftofficeword","officeword"],"ptokens":["microsoft","office","word"],"labels":["high","microsoftoffice","package","vendor","word"],"campaign_type":null,"search_a":"'-109491':15A,18A '-2026':14A,17A 'attack':10A 'code':12A 'cve':13A,16A 'free':6A 'let':7A 'microsoft':1A,19A 'office':20A 'remot':9A 'run':11A 'use':4A 'use-after-fre':3A 'word':2A,21A","search_b":"'7.5':53B 'attack':40B 'bug':32B 'code':42B 'cvss':50B 'fix':56B 'free':31B 'give':48B 'let':37B 'microsoft':23B,34B 'microsoft-offic':22B 'network':45B 'offic':24B,35B 'packag':25B 'run':41B 'score':51B 'sourc':47B 'unauthor':39B 'use':29B 'use-after-fre':28B 'version':57B 'word':26B,36B","search_c":"'allow':65C 'attack':68C 'code':71C 'execut':70C 'free':60C 'microsoft':62C 'network':74C 'offic':63C 'unauthor':67C 'use':58C 'word':64C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:18:17+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-2026-109491","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109491","severity":null,"published_at":"2026-11-10T19:18:17+00:00","modified_at":"2026-11-10T19:18:17+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"}