CVE-2026-72971

Medium

Description

Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.

SeverityMedium

CVSS5.5

Exploit probability—

Product

Microsoft Windows

PublishedAug 11, 2026

First seenAug 11, 2026

Weakness typeCWE-59Improper link resolution

How to fix

Update

microsoft windows_11_26h110.0.28000.2704 or later

Patches

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72971

Affected products

Product	Affected versions	Fixed in
microsoft windows_11_26h1	v < 10.0.28000.2704	10.0.28000.2704

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