{"id":"CVE-2026-20863","title":"Double free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","summary":"Double free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-415"],"vendor":"microsoft","product":"windows_11_23h2","affected":["windows_11_23h2 < 10.0.22631.6491","windows_11_24h2 < 10.0.26100.7623","windows_11_25h2 < 10.0.26200.7623","windows_server_2022 < 10.0.20348.4648","windows_server_2022_23h2 < 10.0.25398.2092","windows_server_2025 < 10.0.26100.32230"],"patched":["windows_11_23h2 10.0.22631.6491","windows_11_24h2 10.0.26100.7623","windows_11_25h2 10.0.26200.7623","windows_server_2022 10.0.20348.4648","windows_server_2022_23h2 10.0.25398.2092","windows_server_2025 10.0.26100.32230"],"published":"2026-01-13","updated":"2026-07-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-20863","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20863","label":"secure@microsoft.com"}],"tags":["nvd"],"epss":0.00395,"epssPercentile":0.33553,"ingestedAt":"2026-07-31T06:58:52.630Z","slug":"CVE-2026-20863","body":"## Overview\n\nDouble free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.\n\n## Affected\n\n- `windows_11_23h2 < 10.0.22631.6491`\n- `windows_11_24h2 < 10.0.26100.7623`\n- `windows_11_25h2 < 10.0.26200.7623`\n- `windows_server_2022 < 10.0.20348.4648`\n- `windows_server_2022_23h2 < 10.0.25398.2092`\n- `windows_server_2025 < 10.0.26100.32230`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_11_23h2 10.0.22631.6491`\n- `windows_11_24h2 10.0.26100.7623`\n- `windows_11_25h2 10.0.26200.7623`\n- `windows_server_2022 10.0.20348.4648`\n- `windows_server_2022_23h2 10.0.25398.2092`\n- `windows_server_2025 10.0.26100.32230`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}