CVE-2026-50428 Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability
An authorized local attacker can exploit an out-of-bounds read in the Windows container isolation driver to disclose sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-50428?
CVE-2026-50428 is a high-severity vulnerability in Microsoft Windows 11 26h1, published on 14 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Out-of-bounds read in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.
Weakness: CWE-125
Which versions are affected by CVE-2026-50428?
It affects 1 product.
Products include Microsoft Windows 11 26h1.
How do I fix CVE-2026-50428?
No fix has been published for CVE-2026-50428 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-50428 being exploited?
There is no known exploitation of CVE-2026-50428 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 26h1
- CVE-2026-85921 Windows Secure Kernel Mode Elevation of Privilege Vulnerability
- CVE-2026-83939 Windows Secure Kernel Mode Elevation of Privilege Vulnerability
- CVE-2026-105005 Windows Schannel Remote Code Execution Vulnerability
- CVE-2026-85850 Windows Kernel Elevation of Privilege Vulnerability
- CVE-2026-97803 Windows Kernel Elevation of Privilege Vulnerability
Sources
Also known as GHSA-v4hp-j4fc-x9fp.