CVE-2026-40403

HighCVSS 8.8/10Last modified Nov 11, 2026

Description

Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to execute code locally.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-122

Affected software

VendorProductVersions
MicrosoftWindows 10 Version 1607>= 10.0.14393.0, < 10.0.14393.9140
MicrosoftWindows 10 Version 1809>= 10.0.17763.0, < 10.0.17763.8755
MicrosoftWindows 10 Version 21H2>= 10.0.19044.0, < 10.0.19044.7291
MicrosoftWindows 10 Version 22H2>= 10.0.19045.0, < 10.0.19045.7417
MicrosoftWindows 11 version 23H2>= 10.0.22631.0, < 10.0.22631.7079
MicrosoftWindows 11 Version 23H2>= 10.0.22631.0, < 10.0.22631.7219
MicrosoftWindows 11 Version 24H2>= 10.0.26100.0, < 10.0.26100.8457
MicrosoftWindows 11 Version 25H2>= 10.0.26200.0, < 10.0.26200.8457
MicrosoftWindows 11 version 26H1>= 10.0.28000.0, < 10.0.28000.2113
MicrosoftWindows Server 2012>= 6.2.9200.0, < 6.2.9200.26079
MicrosoftWindows Server 2012 (Server Core installation)>= 6.2.9200.0, < 6.2.9200.26079
MicrosoftWindows Server 2012 R2>= 6.3.9600.0, < 6.3.9600.23181
MicrosoftWindows Server 2012 R2 (Server Core installation)>= 6.3.9600.0, < 6.3.9600.23181
MicrosoftWindows Server 2016>= 10.0.14393.0, < 10.0.14393.9140
MicrosoftWindows Server 2016 (Server Core installation)>= 10.0.14393.0, < 10.0.14393.9140
MicrosoftWindows Server 2019>= 10.0.17763.0, < 10.0.17763.8755
MicrosoftWindows Server 2019 (Server Core installation)>= 10.0.17763.0, < 10.0.17763.8755
MicrosoftWindows Server 2022>= 10.0.20348.0, < 10.0.20348.5139
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)>= 10.0.25398.0, < 10.0.25398.2330
MicrosoftWindows Server 2025>= 10.0.26100.0, < 10.0.26100.32860
MicrosoftWindows Server 2025 (Server Core installation)>= 10.0.26100.0, < 10.0.26100.32860

References

Timeline

Published
May 12, 2026
Last modified
Nov 11, 2026
NVD status
Analyzed

Related CVEs from 2026

CVE-2026-404047.8Heap-based buffer overflow in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to elevate privileges loCVE-2026-404057.5Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.CVE-2026-404067.5Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.CVE-2026-404077.8Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.CVE-2026-404087.8Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.CVE-2026-404097.8Numeric truncation error in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to elevate privileges locaCVE-2026-40418.8A security flaw has been discovered in Tenda i12 1.0.0.6(2204). Impacted is the function vos_strcpy of the file /goform/exeCommand. The maniCVE-2026-404107.0Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.CVE-2026-404118.8Improper input validation in Azure Virtual Network Gateway allows an authorized attacker to execute code over a network.CVE-2026-404129.8Unrestricted upload of file with dangerous type in Azure Orbital Spatio allows an unauthorized attacker to execute code over a network.CVE-2026-404137.4Windows TCP/IP Denial of Service VulnerabilityCVE-2026-404147.4Windows TCP/IP Denial of Service Vulnerability
CVE-2026-40403: High severity, CVSS 8.8 | Vulnix