CVE-2026-72971 MEDIUM

CVE-2026-72971: Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability

Vendor Microsoft
Product Windows 11 version 26H1
Weakness CWE-59
Published August 11, 2026
Last update August 14, 2026
View on NVD All CVEs

CVSS base score

5.5/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 11, 2026 CVE published
August 14, 2026 Record updated