CVE-2026-50428

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

CVE-2026-50428 is fixed in 2 products on 1 platform, first by KB5101649, released July 14, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.1

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0041

35th percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 11 Version 26H1 for ARM64-based Systems	28000.2525	KB5101649	Jul 14, 2026
Windows 11 version 26H1 for x64-based Systems	28000.2525	KB5101649	Jul 14, 2026

Details

Published
July 14, 2026
Weakness
Out-of-bounds Read
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50428

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