CVE-2026-56168

Published: Jul 14, 2026Modified: Jul 22, 2026

6.5

Vector

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

Exploitability: 2.8 / Impact: 3.6

Source: secure@microsoft.com (Secondary)

Description

Null pointer dereference in Windows SMB Server allows an authorized attacker to deny service over a network.

Affected (8)

Products: Microsoft: Windows 10 21h2, Windows 10 22h2, Windows 11 24h2, Windows 11 25h2, Windows 11 26h1, Windows Server 2022, Windows Server 2025

7 products

Windows 10 21h2

Windows 10 22h2

Windows 11 24h2

Windows 11 25h2

Windows 11 26h1

Windows Server 2022

Windows Server 2025

Configuration A

8 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 21h2	Before 10.0.19044.7548
Microsoft Windows 10 22h2	Before 10.0.19045.7548
Microsoft Windows 11 24h2	Before 10.0.26100.8875
Microsoft Windows 11 25h2	Before 10.0.26200.8875
Microsoft Windows 11 26h1	Before 10.0.28000.2525
Microsoft Windows 11 26h1	Before 10.0.28000.2269
Microsoft Windows Server 2022	Before 10.0.20348.5386
Microsoft Windows Server 2025	Before 10.0.26100.33158

Related CWEs

NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56168

Source: secure@microsoft.com

PatchVendor Advisory

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