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CVE-2026-56172

HighCVSS 7.8/10Last modified Sep 17, 2026

Description

Use after free in Windows VHD miniport driver allows an authorized attacker to elevate privileges locally.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 10 Version 1809	>= 10.0.17763.0, < 10.0.17763.9245
Microsoft	Windows 10 Version 21H2	>= 10.0.19044.0, < 10.0.19044.7725
Microsoft	Windows 10 Version 22H2	>= 10.0.19045.0, < 10.0.19045.7725
Microsoft	Windows 11 version 23H2	>= 10.0.22631.0, < 10.0.22631.7582
Microsoft	Windows 11 Version 23H2	>= 10.0.22631.0, < 10.0.22631.7582
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.9445
Microsoft	Windows 11 Version 25H2	>= 10.0.26200.0, < 10.0.26200.9445
Microsoft	Windows 11 version 26H1	>= 10.0.28000.0, < 10.0.28000.2954
Microsoft	Windows Server 2019	>= 10.0.17763.0, < 10.0.17763.9245
Microsoft	Windows Server 2019 (Server Core installation)	>= 10.0.17763.0, < 10.0.17763.9245
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.5622
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.33438
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.33438

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56172Patch, Vendor Advisory

Timeline

Published: Sep 8, 2026
Last modified: Sep 17, 2026
NVD status: Analyzed

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CVE-2026-56172: High severity, CVSS 7.8 | Vulnix