CVE-2026-50428

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

State: Published
Severity: 7.1 High
Published: Jul 14, 2026
Updated: Nov 1, 2026
Reserved: Jun 4, 2026

Description

Out-of-bounds read in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
Windows 11 version 26H1Microsoft	10.0.28000.0 to before 10.0.28000.2525Affected

References

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

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