CVE-2026-62775: Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability
Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.
Other sources
Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.2704Patch KB5121000
Event History
Frequently Asked Questions
What is the severity of CVE-2026-62775?
CVE-2026-62775 has a medium severity rating of 5.5.
What is CVE-2026-62775?
CVE-2026-62775 is an information disclosure vulnerability in the Windows Container Isolation FS Filter Driver (unionfs.sys) that allows authorized attackers to disclose information locally.
How do I fix CVE-2026-62775?
To fix CVE-2026-62775, apply the latest security updates provided by Microsoft for Windows 11.
Who is affected by CVE-2026-62775?
CVE-2026-62775 affects users of Microsoft Windows 11 using the Container Isolation FS Filter Driver (unionfs.sys).
What type of attack does CVE-2026-62775 enable?
CVE-2026-62775 enables an authorized attacker to disclose sensitive information on the affected system.