MSRC-CVE-2026-50428 — Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability

Summary

Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What type of information could be disclosed by this vulnerability?
Exploiting this vulnerability could allow the disclosure of certain kernel memory content.

Security updates
10.0.28000.2525 — https://support.microsoft.com/help/5101649

Vulnerabilities 1

High 7.1

CVE-2026-50428

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

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

Microsoft Windows 11 version 26H1 Windows

Jul 14, 2026

Revision history

2026-07-14 #1
Information published.

References

CVE-2026-50428 Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50428
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss