CVE-2026-62746

Analyzed Analyzed - Analysis Complete

Buffer Over-Read in Windows Win32K Component

Publication date: 2026-08-11

Last updated on: 2026-08-16

Assigner: Microsoft Corporation

Description

Buffer over-read in Windows Win32K allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-16

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-62746

EUVD

EUVD-2026-56363

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-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 vulnerability is a buffer over-read in Windows Win32K. It allows an authorized attacker to read beyond the intended buffer limits and access sensitive information locally on the system.

Detection Guidance

This vulnerability is a local information disclosure issue in Windows Win32K. Detection typically requires analyzing system behavior or memory dumps rather than network commands. Microsoft's security updates and patches should be applied to address this issue. Check for updates via Windows Update or use commands like 'systeminfo' to verify patch levels.

Impact Analysis

An attacker could exploit this to access confidential or sensitive data stored on your system, potentially leading to further attacks or data breaches.

Compliance Impact

This vulnerability could lead to unauthorized data disclosure, which may violate compliance requirements such as GDPR or HIPAA if sensitive personal or health data is exposed.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Win32K buffer over-read vulnerability. Monitor Microsoft's security advisories for updates and ensure all systems are updated promptly.

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