What is CVE-2026-56168?

CVE-2026-56168 is a medium-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-07-14.

How severe is CVE-2026-56168?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Microsoft Windows 10 Version 21h2

CVE-2026-56168

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
Microsoft Windows 11 Version 25h2 — versions 10.0.26200.0
Microsoft Windows 11 Version 26h1 — versions 10.0.28000.0
Microsoft Windows Server 2022 — versions 10.0.20348.0
Microsoft Windows Server 2025 — versions 10.0.26100.0
Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-56168?: CVE-2026-56168 is a medium-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-07-14.
How severe is CVE-2026-56168?: Medium severity. CVSS v3 base score is 6.5 out of 10.