What is CVE-2026-50428?

CVE-2026-50428 is a high-severity vulnerability in Microsoft Windows 11 Version 26h1, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2026-07-14.

How severe is CVE-2026-50428?

High severity. CVSS v3 base score is 7.1 out of 10.

Out-of-bounds Read in Microsoft Windows 11 Version 26h1

CVE-2026-50428

Out-of-bounds read in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Affected products

Microsoft Windows 11 Version 26h1 — versions 10.0.28000.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

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

Frequently asked questions

What is CVE-2026-50428?: CVE-2026-50428 is a high-severity vulnerability in Microsoft Windows 11 Version 26h1, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2026-07-14.
How severe is CVE-2026-50428?: High severity. CVSS v3 base score is 7.1 out of 10.