CVE-2026-69617: CWE-125: Out-of-bounds Read in Microsoft Windows 11 version 26H1
Description
CVE-2026-69617 is a high-severity vulnerability in Microsoft Windows 11 version 26H1 involving an out-of-bounds read in the Windows Resilient File System (ReFS). This flaw allows an authorized local attacker to elevate privileges. The vulnerability affects specific builds of Windows 11 version 26H1. An official fix is available from Microsoft.
CVSS v3.1
Score 7.0high
Affected software
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-125) is an out-of-bounds read in the Windows Resilient File System (ReFS) component of Microsoft Windows 11 version 26H1. It enables an authorized local attacker to elevate privileges by exploiting improper memory bounds checking. The issue affects Windows 11 builds >=10.0.28000.0 and <10.0.28000.2954, and >=10.0.26100.0 and <10.0.26100.33438. Microsoft has published an official fix to address this vulnerability.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate their privileges, potentially gaining higher-level access on the affected system. The CVSS v3.1 base score is 7.0 (high), indicating significant confidentiality, integrity, and availability impacts if exploited.
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-2026-69617 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T21:21:00.595Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69617","vendor":"Microsoft"}]
Threat ID: 6aa04518acd9273b49fa96fa
Added to database: 09/08/2026, 17:25:44 UTC
Last enriched: 10/16/2026, 21:25:01 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 30
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