What is CVE-2026-54127?

CVE-2026-54127 is a high-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Use After Free. CVSS score: 7.4/10. Published 2026-07-14.

How severe is CVE-2026-54127?

High severity. CVSS v3 base score is 7.4 out of 10.

Use After Free in Microsoft Windows 11 Version 24h2

CVE-2026-54127

Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.

Vulnerability class: Use-After-Free

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

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-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-54127?: CVE-2026-54127 is a high-severity vulnerability in Microsoft Windows 11 Version 24h2, classified under Use After Free. CVSS score: 7.4/10. Published 2026-07-14.
How severe is CVE-2026-54127?: High severity. CVSS v3 base score is 7.4 out of 10.