What’s Vulnerable › Vulnerabilities
CVE-2026-62772: Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-11 · updated 2026-10-30
- Weakness: CWE-122
Description
Heap-based buffer overflow in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.
Affected products
- Microsoft Windows 11 version 26H1: before 10.0.28000.2704 — fixed in 10.0.28000.2704
- Microsoft Windows 11 version 26H1: from 10.0.28000.0 before 10.0.28000.2704 — fixed in 10.0.28000.2704
How to fix
Upgrade to a fixed version: Microsoft Windows 11 version 26H1 10.0.28000.2704; Microsoft Windows 11 version 26H1 10.0.28000.2704. Check the vendor advisory for mitigations.
References
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