CVE-2026-20863

Published: Jan 13, 2026

Modified: Apr 1, 2026

PUBLISHED

CVSS v3.1

7.0

HIGH

Double free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

Vendor	Product	Versions
Microsoft	Windows 11 version 22H3	affected `10.0.22631.0 - < 10.0.22631.6491`
Microsoft	Windows 11 Version 23H2	affected `10.0.22631.0 - < 10.0.22631.6491`
Microsoft	Windows 11 Version 24H2	affected `10.0.26100.0 - < 10.0.26100.7623`
Microsoft	Windows 11 Version 25H2	affected `10.0.26200.0 - < 10.0.26200.7623`
Microsoft	Windows Server 2022	affected `10.0.20348.0 - < 10.0.20348.4648`
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	affected `10.0.25398.0 - < 10.0.25398.2092`
Microsoft	Windows Server 2025	affected `10.0.26100.0 - < 10.0.26100.32230`
Microsoft	Windows Server 2025 (Server Core installation)	affected `10.0.26100.0 - < 10.0.26100.32230`

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

vendor-advisory

patch

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