CVE-2026-54990

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*
	cpe:2.3:o:microsoft:windows_server_2025::::::::

History

22 Jul 2026, 16:18

Type	Values Removed	Values Added
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990 - Vendor Advisory, Patch~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990 - Patch, Vendor Advisory

20 Jul 2026, 14:10

Type	Values Removed	Values Added
CPE		cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:* cpe:2.3:o:microsoft:windows_server_2025:::::::: cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990 -~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990 - Vendor Advisory, Patch
First Time		Microsoft windows 11 24h2 Microsoft windows Server 2025 Microsoft windows 11 25h2 Microsoft Microsoft windows 11 26h1

14 Jul 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-14 17:17

Updated : 2026-07-22 16:18

NVD link : CVE-2026-54990

Mitre link : CVE-2026-54990

CVE.ORG link : CVE-2026-54990

JSON object : View

Products Affected

microsoft

windows_11_25h2
windows_11_24h2
windows_11_26h1
windows_server_2025

CWE

CWE-122

Heap-based Buffer Overflow

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