CVE-2026-40403

HighCVSS 8.8/10Last modified Jun 17, 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

No affected versions have been published.

Timeline

Published
May 12, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

Related CVEs from 2026

CVE-2026-404047.8Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege VulnerabilityCVE-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-2026-404097.8Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege VulnerabilityCVE-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