CVE-2026-40398

Summary

Heap-based buffer overflow in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Affected Software

VendorProductVersion RangeStatus
MicrosoftWindows 10 Version 160710.0.14393.0 < 10.0.14393.9140affected
MicrosoftWindows 10 Version 180910.0.17763.0 < 10.0.17763.8755affected
MicrosoftWindows 10 Version 21H210.0.19044.0 < 10.0.19044.7291affected
MicrosoftWindows 10 Version 22H210.0.19045.0 < 10.0.19045.7417affected
MicrosoftWindows 11 version 23H210.0.22631.0 < 10.0.22631.7079affected
MicrosoftWindows 11 Version 23H210.0.22631.0 < 10.0.22631.7219affected
MicrosoftWindows 11 Version 24H210.0.26100.0 < 10.0.26100.8457affected
MicrosoftWindows 11 Version 25H210.0.26200.0 < 10.0.26200.8457affected
MicrosoftWindows 11 version 26H110.0.28000.0 < 10.0.28000.2113affected
MicrosoftWindows Server 20126.2.9200.0 < 6.2.9200.26079affected
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0 < 6.2.9200.26079affected
MicrosoftWindows Server 2012 R26.3.9600.0 < 6.3.9600.23181affected
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0 < 6.3.9600.23181affected
MicrosoftWindows Server 201610.0.14393.0 < 10.0.14393.9140affected
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 < 10.0.14393.9140affected
MicrosoftWindows Server 201910.0.17763.0 < 10.0.17763.8755affected
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 < 10.0.17763.8755affected
MicrosoftWindows Server 202210.0.20348.0 < 10.0.20348.5139affected
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0 < 10.0.25398.2330affected
MicrosoftWindows Server 202510.0.26100.0 < 10.0.26100.32860affected
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 < 10.0.26100.32860affected

Weaknesses

  • CWE-122: CWE-122: Heap-based Buffer Overflow

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References