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Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-65797 Windows DNS Elevation of Privilege Vulnerability New On this page  CVE-2026-65797  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: Aug 11, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-65797  Impact Elevation of Privilege Max Severity Important Weakness CWE-197: Numeric Truncation Error CWE-122: Heap-based Buffer Overflow CVSS Source Microsoft Vector String CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Metrics CVSS:3.1 6.7 / 5.8  Base score metrics: 6.7 / Temporal score metrics: 5.8  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Local Attack Complexity Low Privileges Required High User Interaction None Scope Unchanged Confidentiality High Integrity High Availability High   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Numeric truncation error in Windows DNS allows an authorized attacker to elevate privileges locally. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Less Likely FAQ What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges. Acknowledgements Rajesh Kumar Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Title: Release date, Content: Aug 11, 2026 Windows 10 Version 1607 for 32-bit Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 10 Version 1607 for 32-bit Systems, Content:, 1 link 5120418  Title: Download Security Update for Windows 10 Version 1607 for 32-bit Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.14393.9418 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 11 Version 26H1 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 26H1 for ARM64-based Systems, Content:, 1 link 5121000  Title: Download Security Update for Windows 11 Version 26H1 for ARM64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.28000.2704 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 11 version 26H1 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 version 26H1 for x64-based Systems, Content:, 1 link 5121000  Title: Download Security Update for Windows 11 version 26H1 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.28000.2704 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows Server 2025 - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2025, Content:, 2 links 5120233  5120228  Title: Download Security Update for Windows Server 2025, Content:, 2 links Security Update  Security Hotpatch Update  Title: Build numbers, Content: 10.0.26100.33296 10.0.26100.33222 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 11 Version 24H2 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 24H2 for x64-based Systems, Content:, 2 links 5121003  5120994  Title: Download Security Update for Windows 11 Version 24H2 for x64-based Systems, Content:, 2 links Security Update  Security Hotpatch Update  Title: Build numbers, Content: 10.0.26100.9168 10.0.26000.9106 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 11 Version 24H2 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 24H2 for ARM64-based Systems, Content:, 2 links 5121003  5120994  Title: Download Security Update for Windows 11 Version 24H2 for ARM64-based Systems, Content:, 2 links Security Update  Security Hotpatch Update  Title: Build numbers, Content: 10.0.26100.9168 10.0.26100.9106 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 11 Version 23H2 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 23H2 for x64-based Systems, Content:, 1 link 5120240  Title: Download Security Update for Windows 11 Version 23H2 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.22631.7517 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 11 Version 23H2 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 23H2 for ARM64-based Systems, Content:, 1 link 5120240  Title: Download Security Update for Windows 11 Version 23H2 for ARM64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.22631.7517 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 11 Version 25H2 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 25H2 for x64-based Systems, Content:, 2 links 5121003  5120994  Title: Download Security Update for Windows 11 Version 25H2 for x64-based Systems, Content:, 2 links Security Update  Security Hotpatch Update  Title: Build numbers, Content: 10.0.26200.9168 10.0.26100.9106 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows Server 2012 R2 (Server Core installation) - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2012 R2 (Server Core installation), Content:, 1 link 5120386  Title: Download Security Update for Windows Server 2012 R2 (Server Core installation), Content:, 1 link Monthly Rollup  Title: Build numbers, Content: 6.3.9600.23337 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows Server 2012 R2 - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2012 R2, Content:, 1 link 5120386  Title: Download Security Update for Windows Server 2012 R2, Content:, 1 link Monthly Rollup  Title: Build numbers, Content: 6.3.9600.23337 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows Server 2012 (Server Core installation) - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2012 (Server Core installation), Content:, 1 link 5120385  Title: Download Security Update for Windows Server 2012 (Server Core installation), Content:, 1 link Monthly Rollup  Title: Build numbers, Content: 6.2.9200.26279 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows Server 2012 - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2012, Content:, 1 link 5120385  Title: Download Security Update for Windows Server 2012, Content:, 1 link Monthly Rollup  Title: Build numbers, Content: 6.2.9200.26279 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows Server 2016 (Server Core installation) - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2016 (Server Core installation), Content:, 1 link 5120418  Title: Download Security Update for Windows Server 2016 (Server Core installation), Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.14393.9418 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows Server 2016 - Elevation of Privilege Important Title: Knowledge Base Articles for Windows Server 2016, Content:, 1 link 5120418  Title: Download Security Update for Windows Server 2016, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.14393.9418 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 10 Version 1607 for x64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 10 Version 1607 for x64-based Systems, Content:, 1 link 5120418  Title: Download Security Update for Windows 10 Version 1607 for x64-based Systems, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.14393.9418 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Aug 11, 2026 Windows 11 Version 25H2 for ARM64-based Systems - Elevation of Privilege Important Title: Knowledge Base Articles for Windows 11 Version 25H2 for ARM64-based Systems, Content:, 2 links 5121003  5120994  Title: Download Security Update for Windows 11 Version 25H2 for ARM64-based Systems, Content:, 2 links Security Update  Security Hotpatch Update  Title: Build numbers, Content: 10.0.26200.9168 10.0.26100.9106 Title: Assigning