CVE-2026-72971

Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability

State: Published
Severity: 5.5 Medium
Published: Aug 11, 2026
Updated: Oct 30, 2026
Reserved: Aug 10, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	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	microsoft

Weaknesses

CWE-59 Improper Link Resolution Before File Access ('Link Following')

Affected Products

Product	Versions
Windows 11 version 26H1Microsoft	10.0.28000.0 to before 10.0.28000.2704Affected

References

Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerabilityvendor-advisorypatch

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