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CVE-2026-83566

HighCVSS 7.0/10Last modified Oct 28, 2026

Description

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

Metrics

CVSS 3.1 7.0/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.9711
Microsoft	Windows 11 Version 25H2	>= 10.0.26200.0, < 10.0.26200.9711
Microsoft	Windows 11 version 26H1	>= 10.0.28000.0, < 10.0.28000.3231
Microsoft	Windows 11 Version 26H2	>= 10.0.26300.0, < 10.0.26300.9711
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.33650
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.33650

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83566Patch, Vendor Advisory

Timeline

Published: Oct 13, 2026
Last modified: Oct 28, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-835677.8Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges locally.CVE-2026-835687.8Improper access control in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.CVE-2026-835697.8Heap-based buffer overflow in HID Parser Library allows an authorized attacker to elevate privileges locally.CVE-2026-83577.8LibreOffice Calc compiles cell formulas when opening a spreadsheet. A heap buffer overflow existed when compiling a very long formula made u CVE-2026-835707.8Use after free in Microsoft Windows Search Component allows an authorized attacker to elevate privileges locally.CVE-2026-835715.5Null pointer dereference in Windows Audio Service allows an authorized attacker to disclose information locally.CVE-2026-835736.8Integer overflow or wraparound in Windows Kernel Mode Driver allows an unauthorized attacker to elevate privileges with a physical attack.CVE-2026-835747.0Use after free in Microsoft Windows Search Component allows an authorized attacker to elevate privileges locally.CVE-2026-835757.0Use after free in Microsoft Windows Search Component allows an authorized attacker to elevate privileges locally.CVE-2026-835789.8Integer underflow (wrap or wraparound) in Windows PowerShell allows an unauthorized attacker to execute code over a network.CVE-2026-835797.8Heap-based buffer overflow in Windows Smart Card allows an authorized attacker to elevate privileges locally.CVE-2026-83585.4LibreOffice Calc can import tracked changes from a spreadsheet document. A heap buffer overflow existed when a document reused the same chan

CVE-2026-83566: High severity, CVSS 7.0 | Vulnix