{"id":"CVE-2026-109503","kind":"vulnerability","aliases":["CVE-2026-109503"],"related":[],"title":"Microsoft Word: double free lets an attacker run code over a network","description":"Double free in Microsoft Office Word allows an unauthorized attacker to execute code over a network.","summary":"A memory bug (double free) in Microsoft Office Word lets an unauthorized attacker run code on the affected computer over a network. The NVD entry gives a CVSS score of 8.8 and no further detail is in the sources.","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","package","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":"2026-11-10T19:24:26+00:00","triaged_at":"2026-11-10T19:33:52+00:00","updated_at":"2026-11-10T19:33:52+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-11-10T19:33:52Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Word: double free lets an attacker run code over a network","impact":"high","summary":"A memory bug (double free) in Microsoft Office Word lets an unauthorized attacker run code on the affected computer over a network. The NVD entry gives a CVSS score of 8.8 and no further detail is in the sources.","audience":"everyone","category":"package","nicknames":[],"who_cares":["microsoft-office","word","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Attacker runs code on the computer over the network","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-109503 for affected Word builds, the fixed build, and whether a user must open a file.","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":0.000646,"input_tokens":4478,"output_tokens":397,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Update Guide entry for CVE-2026-109503 for affected Word builds, the fixed build, and whether a user must open a file.","search":"'-109503':15A,18A '-2026':14A,17A '8.8':58B 'affect':45B 'allow':73C 'attack':7A,40B,76C 'bug':30B 'code':9A,42B,79C 'comput':46B 'cve':13A,16A 'cvss':55B 'detail':62B 'doubl':3A,31B,67C 'entri':52B 'execut':78C 'free':4A,32B,68C 'give':53B 'let':5A,37B 'memori':29B 'microsoft':1A,19A,23B,34B,70C 'microsoft-offic':22B 'network':12A,49B,82C 'nvd':51B 'offic':24B,35B,71C 'office':20A 'packag':25B 'run':8A,41B 'score':56B 'sourc':66B 'unauthor':39B,75C 'window':26B 'word':2A,21A,27B,36B,72C","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","windows","word"],"campaign_type":null,"search_a":"'-109503':15A,18A '-2026':14A,17A 'attack':7A 'code':9A 'cve':13A,16A 'doubl':3A 'free':4A 'let':5A 'microsoft':1A,19A 'network':12A 'office':20A 'run':8A 'word':2A,21A","search_b":"'8.8':58B 'affect':45B 'attack':40B 'bug':30B 'code':42B 'comput':46B 'cvss':55B 'detail':62B 'doubl':31B 'entri':52B 'free':32B 'give':53B 'let':37B 'memori':29B 'microsoft':23B,34B 'microsoft-offic':22B 'network':49B 'nvd':51B 'offic':24B,35B 'packag':25B 'run':41B 'score':56B 'sourc':66B 'unauthor':39B 'window':26B 'word':27B,36B","search_c":"'allow':73C 'attack':76C 'code':79C 'doubl':67C 'execut':78C 'free':68C 'microsoft':70C 'network':82C 'offic':71C 'unauthor':75C 'word':72C","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: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-2026-109503","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109503","severity":null,"published_at":"2026-11-10T19:18:19+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"}