CVE-2026-50428

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Windows Container Isolation FS Filter Driver

Publication date: 2026-07-14

Last updated on: 2026-07-22

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-14

Last Modified

2026-07-22

Generated

2026-08-03

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-50428

EUVD

EUVD-2026-43907

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_11_26h1	to 10.0.28000.2269 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2525 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability in the Windows Container Isolation FS Filter Driver (unionfs.sys). It allows an authorized attacker to read beyond allocated memory and disclose information locally on the affected system.

Impact Analysis

An attacker could exploit this to access sensitive data stored in memory, potentially leading to unauthorized information disclosure. Since it requires local access, physical or network-based access to the system is necessary.

Compliance Impact

This vulnerability could lead to unauthorized data disclosure, which may violate GDPR (data protection) or HIPAA (health information privacy) if sensitive data is exposed. Organizations must address it to maintain compliance.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Container Isolation FS Filter Driver (unionfs.sys). Monitor Microsoft's update guide for patches and install them promptly.

Hi! I’m here to help you understand CVE-2026-50428. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70