{"id":"CVE-2026-119986","kind":"vulnerability","aliases":["CVE-2026-119986"],"related":[],"title":"Microsoft Excel: heap buffer overflow lets a remote attacker run code","description":"Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","summary":"A heap-based buffer overflow in Microsoft Office Excel lets an unauthorized attacker run code over a network. The sources give no fixed version or setting.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["excel","microsoft-office","other","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:20:23+00:00","first_seen_at":"2026-11-10T19:25:06+00:00","triaged_at":"2026-11-10T19:27:58+00:00","updated_at":"2026-11-10T19:27:58+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:27:58Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Excel: heap buffer overflow lets a remote attacker run code","impact":"high","summary":"A heap-based buffer overflow in Microsoft Office Excel lets an unauthorized attacker run code over a network. The sources give no fixed version or setting.","audience":"businesses","category":"other","nicknames":[],"who_cares":["microsoft-office","excel","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs code on the machine over the network","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-119986 for affected builds, fixed versions and whether user interaction is required; source given is NVD only.","how_to_check":"unknown","plain_action":"","product_name":"Microsoft Excel","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organisations running Microsoft Office Excel are exposed according to the NVD entry, which describes a network-reachable flaw needing no authorization. The sources do not say which Excel builds or configurations are affected, or whether opening a crafted file is needed.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000679,"input_tokens":4496,"output_tokens":458,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center entry for CVE-2026-119986 for affected builds, fixed versions and whether user interaction is required; source given is NVD only.","search":"'-119986':14A,17A '-2026':13A,16A 'allow':60C 'attack':9A,37B,63C 'base':27B,53C 'buffer':4A,28B,54C 'code':11A,39B,66C 'cve':12A,15A 'excel':2A,18B,33B,59C 'execut':65C 'fix':47B 'give':45B 'heap':3A,26B,52C 'heap-bas':25B,51C 'let':6A,34B 'microsoft':1A,20B,31B,57C 'microsoft-offic':19B 'network':42B,69C 'offic':21B,32B,58C 'overflow':5A,29B,55C 'remot':8A 'run':10A,38B 'set':50B 'sourc':44B 'unauthor':36B,62C 'version':48B 'window':23B","nicknames":[],"mitigations":[],"who_affected":"Organisations running Microsoft Office Excel are exposed according to the NVD entry, which describes a network-reachable flaw needing no authorization. The sources do not say which Excel builds or configurations are affected, or whether opening a crafted file is needed.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["excel","high","microsoftoffice","other","windows"],"campaign_type":null,"search_a":"'-119986':14A,17A '-2026':13A,16A 'attack':9A 'buffer':4A 'code':11A 'cve':12A,15A 'excel':2A 'heap':3A 'let':6A 'microsoft':1A 'overflow':5A 'remot':8A 'run':10A","search_b":"'attack':37B 'base':27B 'buffer':28B 'code':39B 'excel':18B,33B 'fix':47B 'give':45B 'heap':26B 'heap-bas':25B 'let':34B 'microsoft':20B,31B 'microsoft-offic':19B 'network':42B 'offic':21B,32B 'overflow':29B 'run':38B 'set':50B 'sourc':44B 'unauthor':36B 'version':48B 'window':23B","search_c":"'allow':60C 'attack':63C 'base':53C 'buffer':54C 'code':66C 'excel':59C 'execut':65C 'heap':52C 'heap-bas':51C 'microsoft':57C 'network':69C 'offic':58C 'overflow':55C 'unauthor':62C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:23+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-2026-119986","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119986","severity":null,"published_at":"2026-11-10T19:20:23+00:00","modified_at":"2026-11-10T19:20:23+00:00","first_seen_at":"2026-11-10T19:25:06+00:00","fetched_at":"2026-11-10T19:25:06+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"}