HarborGuard / CVE
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HIGHCVE-2026-40403Published Modified CNA microsoft

CVE-2026-40403: Windows Graphics Component Remote Code Execution Vulnerability

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

Metrics

CVSS v3.1
8.8
Severity
HIGH
Fixed in
6.2.9200.26079
Affected Products
21

Fix available

6.2.9200.260796.3.9600.2318110.0.14393.914010.0.17763.875510.0.19044.729110.0.19045.729110.0.20348.513910.0.22631.707910.0.25398.233010.0.26100.845710.0.26100.3286010.0.26200.845710.0.28000.2113
Patch commits
Affected packages
  • Microsoft / Windows 10 Version 1607
    < 10.0.14393.9140 (from 10.0.14393.0)
  • Microsoft / Windows 10 Version 1809
    < 10.0.17763.8755 (from 10.0.17763.0)
  • Microsoft / Windows 10 Version 21H2
    < 10.0.19044.7291 (from 10.0.19044.0)
  • Microsoft / Windows 10 Version 22H2
    < 10.0.19045.7291 (from 10.0.19045.0)
  • Microsoft / Windows 11 version 22H3
    < 10.0.22631.7079 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 23H2
    < 10.0.22631.7079 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 24H2
    < 10.0.26100.8457 (from 10.0.26100.0)
  • Microsoft / Windows 11 Version 25H2
    < 10.0.26200.8457 (from 10.0.26200.0)
  • Microsoft / Windows 11 version 26H1
    < 10.0.28000.2113 (from 10.0.28000.0)
  • Microsoft / Windows Server 2012
    < 6.2.9200.26079 (from 6.2.9200.0)
  • Microsoft / Windows Server 2012 (Server Core installation)
    < 6.2.9200.26079 (from 6.2.9200.0)
  • Microsoft / Windows Server 2012 R2
    < 6.3.9600.23181 (from 6.3.9600.0)
  • Microsoft / Windows Server 2012 R2 (Server Core installation)
    < 6.3.9600.23181 (from 6.3.9600.0)
  • Microsoft / Windows Server 2016
    < 10.0.14393.9140 (from 10.0.14393.0)
  • Microsoft / Windows Server 2016 (Server Core installation)
    < 10.0.14393.9140 (from 10.0.14393.0)
  • Microsoft / Windows Server 2019
    < 10.0.17763.8755 (from 10.0.17763.0)
  • Microsoft / Windows Server 2019 (Server Core installation)
    < 10.0.17763.8755 (from 10.0.17763.0)
  • Microsoft / Windows Server 2022
    < 10.0.20348.5139 (from 10.0.20348.0)
  • Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)
    < 10.0.25398.2330 (from 10.0.25398.0)
  • Microsoft / Windows Server 2025
    < 10.0.26100.32860 (from 10.0.26100.0)
  • Microsoft / Windows Server 2025 (Server Core installation)
    < 10.0.26100.32860 (from 10.0.26100.0)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
References