{"id":"CVE-2026-114167","kind":"vulnerability","aliases":["CVE-2026-114167"],"related":[],"title":"Windows Codecs Library: heap overflow lets a local attacker run code","description":"Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code locally.","summary":"A heap-based buffer overflow in the Microsoft Windows Codecs Library lets an unauthorized local attacker corrupt memory. The sources say this can lead to code execution on the affected machine.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","windows"],"not_affected_if":[],"how_to_check":"- Check the installed Windows build against Microsoft's security update guide for CVE-2026-114167","fix":null,"status":"open","published_at":"2026-11-10T19:19:10+00:00","first_seen_at":"2026-11-10T19:24:44+00:00","triaged_at":"2026-11-10T19:40:50+00:00","updated_at":"2026-11-10T19:40:50+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:40:50Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Windows Codecs Library: heap overflow lets a local attacker run code","impact":"high","summary":"A heap-based buffer overflow in the Microsoft Windows Codecs Library lets an unauthorized local attacker corrupt memory. The sources say this can lead to code execution on the affected machine.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Attacker runs code on the local Windows machine","analyst_note":"Confirm affected Windows builds, patch version and whether user interaction is needed via the Microsoft Security Update Guide entry for CVE-2026-114167.","how_to_check":"- Check the installed Windows build against Microsoft's security update guide for CVE-2026-114167\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Windows machines with the Windows Codecs Library installed are the affected systems; the sources do not list specific versions or configurations. Systems where users are not local, or that are already fully patched, are not affected. The sources do not say more.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000679,"input_tokens":4502,"output_tokens":458,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Confirm affected Windows builds, patch version and whether user interaction is needed via the Microsoft Security Update Guide entry for CVE-2026-114167.","search":"'-114167':14A,17A '-2026':13A,16A 'affect':50B 'allow':62C 'attack':9A,36B,65C 'base':23B,54C 'buffer':24B,55C 'code':11A,46B,68C 'codec':2A,30B,60C 'corrupt':37B 'cve':12A,15A 'execut':47B,67C 'heap':4A,22B,53C 'heap-bas':21B,52C 'infrastructur':18B 'lead':44B 'let':6A,32B 'librari':3A,31B,61C 'local':8A,35B,69C 'machin':51B 'memori':38B 'microsoft':28B,58C 'overflow':5A,25B,56C 'run':10A 'say':41B 'sourc':40B 'unauthor':34B,64C 'window':1A,19B,29B,59C","nicknames":[],"mitigations":[],"who_affected":"Windows machines with the Windows Codecs Library installed are the affected systems; the sources do not list specific versions or configurations. Systems where users are not local, or that are already fully patched, are not affected. The sources do not say more.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","windows"],"campaign_type":null,"search_a":"'-114167':14A,17A '-2026':13A,16A 'attack':9A 'code':11A 'codec':2A 'cve':12A,15A 'heap':4A 'let':6A 'librari':3A 'local':8A 'overflow':5A 'run':10A 'window':1A","search_b":"'affect':50B 'attack':36B 'base':23B 'buffer':24B 'code':46B 'codec':30B 'corrupt':37B 'execut':47B 'heap':22B 'heap-bas':21B 'infrastructur':18B 'lead':44B 'let':32B 'librari':31B 'local':35B 'machin':51B 'memori':38B 'microsoft':28B 'overflow':25B 'say':41B 'sourc':40B 'unauthor':34B 'window':19B,29B","search_c":"'allow':62C 'attack':65C 'base':54C 'buffer':55C 'code':68C 'codec':60C 'execut':67C 'heap':53C 'heap-bas':52C 'librari':61C 'local':69C 'microsoft':58C 'overflow':56C 'unauthor':64C 'window':59C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:19:10+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/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-2026-114167","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114167","severity":null,"published_at":"2026-11-10T19:19:10+00:00","modified_at":"2026-11-10T19:19:10+00:00","first_seen_at":"2026-11-10T19:24:44+00:00","fetched_at":"2026-11-10T19:24:44+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"}