CVE-2026-59128

Analyzed Analyzed - Analysis Complete

Out-of-bounds Read in Windows Encrypting File System

Publication date: 2026-08-11

Last updated on: 2026-08-16

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows Encrypting File System (EFS) allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-16

Generated

2026-09-01

AI Q&A

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-59128

EUVD

EUVD-2026-56309

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1607	to 10.0.14393.9418 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_server_2016	to 10.0.14393.9418 (exc)
microsoft	windows_server_2019	to 10.0.17763.9115 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (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 vulnerability is an out-of-bounds read flaw in Windows Encrypting File System (EFS). It allows an authorized attacker with local access to read beyond the intended memory boundaries, potentially exposing sensitive information stored in encrypted files.

Detection Guidance

This vulnerability is an out-of-bounds read in Windows Encrypting File System (EFS) that allows local information disclosure. Detection typically requires reviewing system logs for EFS-related errors or unusual file access patterns. Microsoft may provide detection tools or updates via Windows Update.

Impact Analysis

An attacker could exploit this to access confidential data on your system if they have local access. This includes sensitive files encrypted by EFS, leading to potential data breaches or unauthorized information disclosure.

Compliance Impact

This vulnerability could lead to non-compliance with data protection regulations like GDPR or HIPAA if it results in unauthorized access to personal or health information. Organizations may face penalties for failing to protect sensitive data adequately.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the EFS vulnerability. Monitor Microsoft's update guide for patches and install them promptly.

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