High MSRC-CVE-2026-113771 1 CVE

Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability

Published Nov 10, 2026 · Updated Nov 10, 2026

Vendor: Microsoft

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

Security updates
10.0.28000.3501 — https://support.microsoft.com/help/5132059

Vulnerabilities 1

Medium 5.5

CVE-2026-113771

Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability

Off-by-one error in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Microsoft Windows 11 version 26H1 Windows

Nov 10, 2026

Revision history

2026-11-10 #1
Information published.

References

CVE-2026-113771 Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-113771
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