CVE-2026-69858: CWE-416: Use After Free in Microsoft Windows Server 2022
Description
CVE-2026-69858 is a use-after-free vulnerability in the Windows DNS component of Microsoft Windows Server 2022. This flaw allows an unauthorized attacker to execute code remotely over a network. The vulnerability affects specific builds of Windows Server 2022 prior to the patched versions. A high-severity CVSS score of 8.1 has been assigned. An official fix is available from Microsoft.
CVSS v3.1
Score 8.1high
Affected software
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
CVE-2026-69858 is a use-after-free vulnerability (CWE-416) in the Windows DNS service on Microsoft Windows Server 2022. This vulnerability enables an attacker without privileges or user interaction to execute arbitrary code remotely over the network. The affected versions include Windows Server 2022 builds from 10.0.20348.0 up to but not including 10.0.20348.5622, and from 10.0.26100.0 up to but not including 10.0.26100.33438. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows remote code execution with high impact on confidentiality, integrity, and availability. An attacker can run arbitrary code on the affected system without requiring privileges or user interaction, potentially leading to full system compromise.
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-2026-69858 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T22:51:46.191Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69858","vendor":"Microsoft"}]
Threat ID: 6aa04534acd9273b49fa9a6a
Added to database: 09/08/2026, 17:26:12 UTC
Last enriched: 10/16/2026, 21:37:23 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 27
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