CVE-2026-113761: Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability

Q: What level of access does an attacker need to exploit this issue?

An attacker must already be authorized and have local access to the affected system. The vector indicates low privileges are required and no user interaction is needed.

Q: How difficult is exploitation expected to be?

The vulnerability is rated as requiring high attack complexity. Successful exploitation could result in elevation of privilege with high impact to confidentiality, integrity, and availability.

Q: Which product is identified as affected?

The affected software listed is Microsoft Windows 11. The vulnerable component is the Windows Container Isolation FS Filter Driver, unionfs.sys.

Published Nov 10, 2026

Updated

Untrusted pointer dereference in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Other sources

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

— Microsoft

Affected Software

2 affected componentsFixes available

Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.3501

10.0.28000.3501

Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.3501

10.0.28000.3501

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 10.0.28000.3501Patch KB5132059

Event History

Nov 10, 2026

CVE Published

via Microsoft·04:00 PM

Data Sourced

via Microsoft·04:00 PM

DescriptionSeverityWeakness

Data Sourced

via Microsoft·04:00 PM

Affected Software

CVE Published

via MITRE·06:18 PM

Data Sourced

via MITRE·06:18 PM

DescriptionSeverity

Data Sourced

via NVD·07:18 PM

DescriptionSeverityWeakness

Frequently Asked Questions

What level of access does an attacker need to exploit this issue?

An attacker must already be authorized and have local access to the affected system. The vector indicates low privileges are required and no user interaction is needed.

How difficult is exploitation expected to be?

The vulnerability is rated as requiring high attack complexity. Successful exploitation could result in elevation of privilege with high impact to confidentiality, integrity, and availability.

Which product is identified as affected?

The affected software listed is Microsoft Windows 11. The vulnerable component is the Windows Container Isolation FS Filter Driver, unionfs.sys.

CVE-2026-113761: Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability

Other sources

Affected Software

Remediation

Event History

Frequently Asked Questions

What level of access does an attacker need to exploit this issue?

How difficult is exploitation expected to be?

Which product is identified as affected?

Company

Resources

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Frequently Asked Questions

What level of access does an attacker need to exploit this issue?

How difficult is exploitation expected to be?

Which product is identified as affected?