{"id":"CVE-2026-118295","kind":"vulnerability","aliases":["CVE-2026-118295"],"related":[],"title":"Microsoft Excel: stack buffer overflow lets a remote attacker run code","description":"Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.","summary":"A stack-based buffer overflow in Microsoft Excel lets an unauthorized attacker trigger it over a network. The sources say an attacker can execute code on the affected machine.","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","package","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:19:42+00:00","first_seen_at":"2026-11-10T19:24:51+00:00","triaged_at":"2026-11-10T19:29:56+00:00","updated_at":"2026-11-10T19:29:56+00:00","category":"package","confidence":0.5,"triage":{"at":"2026-11-10T19:29:56Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Excel: stack buffer overflow lets a remote attacker run code","impact":"high","summary":"A stack-based buffer overflow in Microsoft Excel lets an unauthorized attacker trigger it over a network. The sources say an attacker can execute code on the affected machine.","audience":"everyone","category":"package","nicknames":[],"who_cares":["microsoft-excel","windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"no","worst_case":"attacker runs code on the affected computer over the network","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-118295 for affected versions, fixed builds and whether user interaction (opening a file) is required.","how_to_check":"unknown","plain_action":"","product_name":"Microsoft Office Excel","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":0.000643,"input_tokens":4496,"output_tokens":386,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-118295 for affected versions, fixed builds and whether user interaction (opening a file) is required.","search":"'-118295':14A,17A '-2026':13A,16A 'affect':54B 'allow':65C 'attack':9A,38B,48B,68C 'base':29B,58C 'buffer':4A,30B,59C 'code':11A,51B,71C 'cve':12A,15A 'excel':2A,20A,23B,34B,64C 'execut':50B,70C 'let':6A,35B 'machin':55B 'microsoft':1A,18A,22B,33B,62C 'microsoft-excel':21B 'network':43B,74C 'offic':63C 'office':19A 'overflow':5A,31B,60C 'packag':24B 'remot':8A 'run':10A 'say':46B 'sourc':45B 'stack':3A,28B,57C 'stack-bas':27B,56C 'trigger':39B 'unauthor':37B,67C 'window':25B","nicknames":[],"mitigations":[],"who_affected":null,"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","package","vendor","windows"],"campaign_type":null,"search_a":"'-118295':14A,17A '-2026':13A,16A 'attack':9A 'buffer':4A 'code':11A 'cve':12A,15A 'excel':2A,20A 'let':6A 'microsoft':1A,18A 'office':19A 'overflow':5A 'remot':8A 'run':10A 'stack':3A","search_b":"'affect':54B 'attack':38B,48B 'base':29B 'buffer':30B 'code':51B 'excel':23B,34B 'execut':50B 'let':35B 'machin':55B 'microsoft':22B,33B 'microsoft-excel':21B 'network':43B 'overflow':31B 'packag':24B 'say':46B 'sourc':45B 'stack':28B 'stack-bas':27B 'trigger':39B 'unauthor':37B 'window':25B","search_c":"'allow':65C 'attack':68C 'base':58C 'buffer':59C 'code':71C 'excel':64C 'execut':70C 'microsoft':62C 'network':74C 'offic':63C 'overflow':60C 'stack':57C 'stack-bas':56C 'unauthor':67C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:42+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-2026-118295","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118295","severity":null,"published_at":"2026-11-10T19:19:42+00:00","modified_at":"2026-11-10T19:19:43+00:00","first_seen_at":"2026-11-10T19:24:51+00:00","fetched_at":"2026-11-10T19:24:51+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"}