PT-2026-58407 · Microsoft · Windows 11 Version 26H1

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-50428

Mitre

CVSS v3.1

7.1

High

Base vector

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

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

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-50428

Affected Products

Windows 11 Version 26H1

References · 2

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50428 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-50428 · Security Note