{"id":"CVE-2026-113856","aliases":["EUVD-2026-121962","GHSA-4364-j9p3-qr9j"],"status":"published","title":"Windows Hyper-V Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges 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":"2026-11-14","score":0.00335,"percentile":0.27267,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-11-10T18:19:08Z","modified":"2026-11-10T21:32:55Z","products":[{"vendor":"microsoft","product":"windows 10 version 21h2"},{"vendor":"microsoft","product":"windows 10 version 22h2"},{"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)"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-113856","tags":["vendor-advisory","patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113856"},{"url":"https://github.com/advisories/GHSA-4364-j9p3-qr9j"}],"sources":{"cve":[{"id":"CVE-2026-113856","title":"Windows Hyper-V Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-11-10T18:19:08.325Z","modified":"2026-11-13T18:07:57.054Z","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":"2026-11-10T19:39:58.44836Z"}],"euvd":[{"id":"EUVD-2026-121962","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-11-10T18:19:08Z","modified":"2026-11-13T18:07:57Z","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":"2026-11-10T23:24:33.201322Z"}],"ghsa":[{"id":"GHSA-4364-j9p3-qr9j","title":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges...","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-11-10T21:32:50Z","modified":"2026-11-10T21:32:55Z","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":"2026-11-10T21:57:51.137748Z"}],"nvd":[{"id":"CVE-2026-113856","description":"Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-11-10T19:19:06.327Z","modified":"2026-11-10T20:17:59.53Z","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":"2026-11-10T22:21:32.984056Z"}]}}