CVE-2026-62775

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

Published Aug 11, 2026 CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Description
Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Microsoft windows 11 26h1
CPEs cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
Vendors & Products Microsoft windows 11 26h1
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.
Title Windows Container Isolation FS Filter Driver (unionfs.sys) Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft windows 11 26h1
Weaknesses CWE-863
CPEs cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*
Vendors & Products Microsoft
Microsoft windows 11 26h1
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Nov 10, 2026, 10:00 PM
Reserved
Jul 14, 2026, 9:04 PM
Status
Analyzed
Published
Aug 11, 2026, 5:18 PM
Modified
Oct 24, 2026, 4:10 PM