CVE-2026-50428

HIGH

Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50428

Scores

CVSS v3 7.1
EPSS 0.0030
EPSS Percentile 22.8%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-125
Status published
Products (4)
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.2269
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.2525
microsoft/windows_11_26h1 < 10.0.28000.2269
microsoft/windows_11_26h1 < 10.0.28000.2525
Published Jul 14, 2026
Tracked Since Jul 14, 2026