{"id":"CVE-2026-83931","aliases":["EUVD-2026-100058","GHSA-xcx3-5wrv-mp9m"],"status":"published","title":"Windows Hyper-V Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.003,"percentile":0.2295,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-10-13T19:01:03Z","modified":"2026-11-10T20:43:10Z","products":[{"vendor":"microsoft","product":"windows 11 version 23h2"},{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows 11 version 26h2"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_11_23h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_11_26h2"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83931","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83931"},{"url":"https://github.com/advisories/GHSA-xcx3-5wrv-mp9m"}],"sources":{"cve":[{"id":"CVE-2026-83931","title":"Windows Hyper-V Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.","status":"published","published":"2026-10-13T19:01:03.206Z","modified":"2026-11-10T20:43:10.438Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-10T22:18:29.471829Z"}],"euvd":[{"id":"EUVD-2026-100058","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.","status":"published","published":"2026-10-13T19:01:03Z","modified":"2026-11-10T20:43:10Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:57.125737Z"}],"ghsa":[{"id":"GHSA-xcx3-5wrv-mp9m","title":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.","status":"published","published":"2026-10-13T21:35:13Z","modified":"2026-10-13T21:35:16Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T15:13:17.40783Z"}],"nvd":[{"id":"CVE-2026-83931","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.","status":"published","published":"2026-10-13T19:20:49.703Z","modified":"2026-10-26T13:17:30.813Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:12:58.13117Z"}]}}