CVE-2026-69491: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
CVE-2026-69491 is a critical heap-based buffer overflow vulnerability in Microsoft Windows 10 Version 1607's DirectMusic component. It allows an unauthorized attacker to execute code remotely over a network without user interaction. The vulnerability affects multiple Windows 10 builds and earlier Windows versions as specified. An official fix is available from Microsoft.
CVSS v3.1
Score 9.8critical
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-122) involves a heap-based buffer overflow in the Microsoft DirectMusic component of Windows 10 Version 1607 and related builds. Exploitation can lead to remote code execution by an unauthenticated attacker over the network. The CVSS 3.1 base score is 9.8, indicating critical severity with high impact on confidentiality, integrity, and availability. Microsoft has published an official fix addressing this issue.
Potential Impact
Successful exploitation allows remote code execution without privileges or user interaction, potentially leading to full system compromise. The vulnerability impacts confidentiality, integrity, and availability of affected systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69491 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T21:07:24.908Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69491","vendor":"Microsoft"}]
Threat ID: 6aa04501acd9273b49fa8133
Added to database: 09/08/2026, 17:25:21 UTC
Last enriched: 10/16/2026, 21:16:34 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 40
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