CVE-2026-69794

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Buffer Over-Read in Windows Encrypting File System

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Buffer over-read in Windows Encrypting File System (EFS) allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-69794

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_encrypting_file_system	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-126	The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

Attack-Flow Graph

Executive Summary

This is a buffer over-read vulnerability in Windows Encrypting File System (EFS). It allows an authorized attacker to read beyond the intended memory buffer, potentially exposing sensitive information stored locally on the system.

Impact Analysis

An attacker could exploit this to access confidential data stored on your system, such as encrypted files or sensitive system information. Since it requires local access, physical or network-based access to the machine is necessary.

Compliance Impact

This vulnerability could lead to unauthorized disclosure of personal or sensitive data, violating compliance requirements like GDPR (data protection) or HIPAA (health information privacy). Organizations may face penalties or legal consequences if such breaches occur.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft to patch the EFS buffer over-read vulnerability. Monitor Microsoft's security advisories for patches and disable EFS if not required.

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