{"id":"CVE-2026-118719","kind":"vulnerability","aliases":["CVE-2026-118719"],"related":[],"title":"Microsoft Excel: double free lets a remote attacker run code","description":"Double free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","summary":"A memory bug (double free) in Microsoft Excel can be triggered over a network. A successful attacker can run code on the victim's computer without logging in.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Microsoft Office Excel","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["microsoft-excel","other","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:47+00:00","first_seen_at":"2026-11-10T19:24:54+00:00","triaged_at":"2026-11-10T19:28:21+00:00","updated_at":"2026-11-10T19:28:21+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:28:21Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Excel: double free lets a remote attacker run code","impact":"high","summary":"A memory bug (double free) in Microsoft Excel can be triggered over a network. A successful attacker can run code on the victim's computer without logging in.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-excel","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs code on the victim's computer","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-118719 for affected versions, fixed builds and whether a user must open a file.","how_to_check":"unknown","plain_action":"","product_name":"Microsoft Office Excel","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Microsoft Excel installations are affected according to the NVD entry; the sources do not name affected versions or the trigger path in detail. unknown","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000651,"input_tokens":4480,"output_tokens":405,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-118719 for affected versions, fixed builds and whether a user must open a file.","search":"'-118719':13A,16A '-2026':12A,15A 'allow':58C 'attack':8A,41B,61C 'bug':27B 'code':10A,44B,64C 'comput':49B 'cve':11A,14A 'doubl':3A,28B,52C 'excel':2A,19A,22B,32B,57C 'execut':63C 'free':4A,29B,53C 'let':5A 'log':51B 'memori':26B 'microsoft':1A,17A,21B,31B,55C 'microsoft-excel':20B 'network':38B,67C 'offic':56C 'office':18A 'remot':7A 'run':9A,43B 'success':40B 'trigger':35B 'unauthor':60C 'victim':47B 'window':24B 'without':50B","nicknames":[],"mitigations":[],"who_affected":"Microsoft Excel installations are affected according to the NVD entry; the sources do not name affected versions or the trigger path in detail. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":null,"pkeys":["microsoftofficeexcel","officeexcel"],"ptokens":["excel","microsoft","office"],"labels":["high","microsoftexcel","other","vendor","windows"],"campaign_type":null,"search_a":"'-118719':13A,16A '-2026':12A,15A 'attack':8A 'code':10A 'cve':11A,14A 'doubl':3A 'excel':2A,19A 'free':4A 'let':5A 'microsoft':1A,17A 'office':18A 'remot':7A 'run':9A","search_b":"'attack':41B 'bug':27B 'code':44B 'comput':49B 'doubl':28B 'excel':22B,32B 'free':29B 'log':51B 'memori':26B 'microsoft':21B,31B 'microsoft-excel':20B 'network':38B 'run':43B 'success':40B 'trigger':35B 'victim':47B 'window':24B 'without':50B","search_c":"'allow':58C 'attack':61C 'code':64C 'doubl':52C 'excel':57C 'execut':63C 'free':53C 'microsoft':55C 'network':67C 'offic':56C 'unauthor':60C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:47+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-2026-118719","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118719","severity":null,"published_at":"2026-11-10T19:19:47+00:00","modified_at":"2026-11-10T19:19:47+00:00","first_seen_at":"2026-11-10T19:24:54+00:00","fetched_at":"2026-11-10T19:24:54+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"}