CVE-2026-70234

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Buffer Over-Read in Windows Desktop Window Manager

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Buffer over-read in Desktop Window Manager allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70234

EUVD

EUVD-2026-99200

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

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 the Desktop Window Manager component of Microsoft Windows. It allows an authorized attacker with local access to read beyond the intended buffer boundaries, potentially exposing sensitive information stored in memory.

Detection Guidance

This vulnerability is a local information disclosure issue in Desktop Window Manager. Detection typically involves monitoring for unusual memory access patterns or crashes in dwm.exe. Check Windows Event Viewer for application crashes related to Desktop Window Manager. Use Process Explorer to inspect dwm.exe memory access. Ensure all Windows updates are applied to mitigate this issue.

Impact Analysis

An attacker could exploit this to access sensitive data on your system, such as passwords, encryption keys, or other confidential 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, which may violate GDPR, HIPAA, or other privacy regulations. Organizations must address it to maintain compliance and protect user data.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Desktop Window Manager vulnerability. Monitor Microsoft's update guide for patches and install them as soon as available.

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