CVE-2026-62743 - Vulnerability Details

- Win32k Information Disclosure Vulnerability

Description

Out-of-bounds read in Windows Win32K allows an authorized attacker to disclose information locally.

Published: 2026-08-11

Score: 5.5 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

Out-of-bounds read in Windows Win32K allows an authorized attacker to disclose information locally. The vulnerability stems from a boundary checking flaw in a kernel component, enabling a local exploit that can reveal sensitive data. This is a type of memory corruption weakness (CWE‑125).

Affected Systems

Microsoft Windows 10 versions 1607, 1809, 21H2, 22H2; Windows 11 versions 23H2, 24H2, 25H2, 26H1; Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025, including Server Core installations.

Risk and Exploitability

The CVSS score of 5.5 indicates a moderate severity, while the EPSS score of <1% suggests a low exploitation probability. The vulnerability is not listed in CISA KEV. Exploitation requires local authorization; remote access is not described. The risk is moderate, so organizations should ensure the flaw is addressed through patching or monitoring.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

Windows 10 Version 1607

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9418

Microsoft

Windows 10 Version 1809

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.9121

Microsoft

Windows 10 Version 21H2

affected

Version	Status	Constraints
`10.0.19044.0`	affected	< 10.0.19044.7663

Microsoft

Windows 10 Version 22H2

affected

Version	Status	Constraints
`10.0.19045.0`	affected	< 10.0.19045.7663

Microsoft

Windows 11 version 23H2

affected

Version	Status	Constraints
`10.0.22631.0`	affected	< 10.0.22631.7517

Microsoft

Windows 11 Version 23H2

affected

Version	Status	Constraints
`10.0.22631.0`	affected	< 10.0.22631.7517

Microsoft

Windows 11 Version 24H2

affected

Version	Status	Constraints
`10.0.26100.0`	affected	< 10.0.26100.9168

Microsoft

Windows 11 Version 25H2

affected

Version	Status	Constraints
`10.0.26200.0`	affected	< 10.0.26200.9168

Microsoft

Windows 11 version 26H1

affected

Version	Status	Constraints
`10.0.28000.0`	affected	< 10.0.28000.2704

Microsoft

Windows Server 2012

affected

Version	Status	Constraints
`6.2.9200.0`	affected	< 6.2.9200.26280

Microsoft

Windows Server 2012 (Server Core installation)

affected

Version	Status	Constraints
`6.2.9200.0`	affected	< 6.2.9200.26280

Microsoft

Windows Server 2012 R2

affected

Version	Status	Constraints
`6.3.9600.0`	affected	< 6.3.9600.23338

Microsoft

Windows Server 2012 R2 (Server Core installation)

affected

Version	Status	Constraints
`6.3.9600.0`	affected	< 6.3.9600.23338

Microsoft

Windows Server 2016

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9418

Microsoft

Windows Server 2016 (Server Core installation)

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9418

Microsoft

Windows Server 2019

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.9121

Microsoft

Windows Server 2019 (Server Core installation)

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.9121

Microsoft

Windows Server 2022

affected

Version	Status	Constraints
`10.0.20348.0`	affected	< 10.0.20348.5499

Microsoft

Windows Server 2025

affected

Version	Status	Constraints
`10.0.26100.0`	affected	< 10.0.26100.33296

Microsoft

Windows Server 2025 (Server Core installation)

affected

Version	Status	Constraints
`10.0.26100.0`	affected	< 10.0.26100.33296

Configuration 1 [-]

OR	cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_1607:::::::x86:*
	cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_1809:::::::x86:*
	cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_10_21h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_21h2:::::::x86:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::x86:*
	cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*
	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
	cpe:2.3:o:microsoft:windows_server_2016::::::::
	cpe:2.3:o:microsoft:windows_server_2019::::::::
	cpe:2.3:o:microsoft:windows_server_2022::::::::
	cpe:2.3:o:microsoft:windows_server_2025::::::::

No data.

Vendor Product Confidence Versions

Microsoft

Windows 10 1607

86%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9418)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Windows 10 1809

86%

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.9115)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Windows 10 21h2

86%

Version	Status	Scheme	Platform
`[10.0.19044.0,10.0.19044.7663)`	affected	generic	['32-bit_systems', 'arm64-based_systems', 'x64-based_systems']

Microsoft

Windows 10 22h2

86%

Version	Status	Scheme	Platform
`[10.0.19045.0,10.0.19045.7663)`	affected	generic	['32-bit_systems', 'arm64-based_systems', 'x64-based_systems']

Microsoft

Windows 11 23h2

86%

Version	Status	Scheme	Platform
`[10.0.22631.0,10.0.22631.7517)`	affected	generic	['arm64-based_systems']

Microsoft

Windows 11 23h2

86%

Version	Status	Scheme	Platform
`[10.0.22631.0,10.0.22631.7517)`	affected	generic	['x64-based_systems']

Microsoft

Windows 11 24h2

86%

Version	Status	Scheme	Platform
`[10.0.26100.0,10.0.26100.9168)`	affected	generic	['arm64-based_systems', 'x64-based_systems']

Microsoft

Windows 11 25h2

86%

Version	Status	Scheme	Platform
`[10.0.26200.0,10.0.26200.9168)`	affected	generic	['arm64-based_systems', 'x64-based_systems']

Microsoft

Windows 11 26h1

86%

Version	Status	Scheme	Platform
`[10.0.28000.0,10.0.28000.2704)`	affected	generic	['arm64-based_systems', 'x64-based_systems']

Microsoft

Windows Server 2012

100%

Version	Status	Scheme	Platform
`[6.2.9200.0,6.2.9200.26280)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[6.2.9200.0,6.2.9200.26280)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 R2

100%

Version	Status	Scheme	Platform
`[6.3.9600.0,6.3.9600.23338)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 R2 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[6.3.9600.0,6.3.9600.23338)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2016

100%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9418)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2016 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9418)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2019

100%

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.9115)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2019 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.9115)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2022

100%

Version	Status	Scheme	Platform
`[10.0.20348.0,10.0.20348.5499)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2025

100%

Version	Status	Scheme	Platform
`[10.0.26100.0,10.0.26100.33296)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2025 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[10.0.26100.0,10.0.26100.33296)`	affected	generic	['x64-based_systems']

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Apply the latest Windows security update that resolves CVE‑2026‑62743 for all affected Windows 10, Windows 11, and Windows Server releases
Enforce least‑privilege for local accounts and enable auditing of file and registry read operations to detect any anomalous behavior
Enable Windows Defender Exploit Guard to monitor and block suspicious memory operations related to Win32K

Generated by OpenCVE AI on August 12, 2026 at 16:11 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00387.

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62743

History

Fri, 14 Aug 2026 13:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Microsoft windows Server 2012 (server Core Installation) Microsoft windows Server 2012 R2 Microsoft windows Server 2012 R2 (server Core Installation) Microsoft windows Server 2016 (server Core Installation) Microsoft windows Server 2019 (server Core Installation) Microsoft windows Server 2025 (server Core Installation)
Vendors & Products		Microsoft windows Server 2012 (server Core Installation) Microsoft windows Server 2012 R2 Microsoft windows Server 2012 R2 (server Core Installation) Microsoft windows Server 2016 (server Core Installation) Microsoft windows Server 2019 (server Core Installation) Microsoft windows Server 2025 (server Core Installation)

Thu, 13 Aug 2026 17:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1
CPEs		cpe:2.3:o:microsoft:windows_10_1607:::::::x64:* cpe:2.3:o:microsoft:windows_10_1809:::::::x64:* cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:* cpe:2.3:o:microsoft:windows_10_21h2:::::::x64:* cpe:2.3:o:microsoft:windows_10_21h2:::::::x86:* cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:* cpe:2.3:o:microsoft:windows_10_22h2:::::::x64:* cpe:2.3:o:microsoft:windows_10_22h2:::::::x86:* cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:* cpe:2.3:o:microsoft:windows_server_2012:-:::::::* cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
Vendors & Products		Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1

Tue, 11 Aug 2026 20:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Tue, 11 Aug 2026 17:15:00 +0000

Type	Values Removed	Values Added
Description		Out-of-bounds read in Windows Win32K allows an authorized attacker to disclose information locally.
Title		Win32k Information Disclosure Vulnerability
First Time appeared		Microsoft Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows Server 2012 Microsoft windows Server 2012 R2 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025
Weaknesses		CWE-125
CPEs		cpe:2.3:o:microsoft:windows_10_1607:::::::x86:* cpe:2.3:o:microsoft:windows_10_1809:::::::x86:* cpe:2.3:o:microsoft:windows_10_21H2:::::::x86:* cpe:2.3:o:microsoft:windows_10_22H2:::::::x64:* cpe:2.3:o:microsoft:windows_11_23H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_23H2:::::::x64:* cpe:2.3:o:microsoft:windows_11_24H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_26H1:::::::x64:* cpe:2.3:o:microsoft:windows_server_2012:::::::x64:* cpe:2.3:o:microsoft:windows_server_2012_R2:::::::x64:* cpe:2.3:o:microsoft:windows_server_2016:::::::: cpe:2.3:o:microsoft:windows_server_2019:::::::: cpe:2.3:o:microsoft:windows_server_2022:::::::: cpe:2.3:o:microsoft:windows_server_2025::::::::
Vendors & Products		Microsoft Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows Server 2012 Microsoft windows Server 2012 R2 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62743
Metrics		cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}`

Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 Windows 10 22h2 Windows 11 23h2 Windows 11 23h2 Windows 11 24h2 Windows 11 24h2 Windows 11 25h2 Windows 11 25h2 Windows 11 26h1 Windows 11 26h1 Windows Server 2012 Windows Server 2012 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-08-11T17:06:03.158Z

Updated: 2026-08-31T20:06:49.719Z

Reserved: 2026-07-14T21:01:21.823Z

Link: CVE-2026-62743

Vulnrichment

Updated: 2026-08-11T19:38:47.555Z

NVD

Status : Analyzed

Published: 2026-08-11T17:18:26.353

Modified: 2026-08-16T19:16:59.560

Link: CVE-2026-62743

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-14T12:32:38Z

Weaknesses

CWE-125
Out-of-bounds Read

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

Exploitation none

Automatable no

Technical Impact partial

Subscriptions

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