CVE-2026-69588: CWE-401: Missing Release of Memory after Effective Lifetime in Microsoft Windows 11 version 23H2
Description
CVE-2026-69588 is a high-severity vulnerability in Microsoft Windows 11 version 23H2 involving missing release of memory after its effective lifetime in the Windows TCP/IP stack. This flaw allows an unauthorized attacker to cause a denial of service (DoS) over a network by exhausting system resources. The vulnerability affects multiple builds of Windows 11 23H2 prior to specific patched versions. An official fix is available from Microsoft.
CVSS v3.1
Score 7.5high
Affected software
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 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-401 (Missing Release of Memory after Effective Lifetime), exists in the Windows TCP/IP implementation in Windows 11 version 23H2. The flaw allows an attacker without privileges or user interaction to trigger a denial of service by causing the system to retain memory beyond its intended lifetime, leading to resource exhaustion. The CVSS 3.1 base score is 7.5, indicating high severity, with network attack vector, low attack complexity, no privileges required, and no user interaction needed. Microsoft has published an official fix for affected versions.
Potential Impact
An attacker can remotely cause a denial of service condition by exploiting this vulnerability, leading to system instability or crash due to memory exhaustion. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
An official fix from Microsoft is available and should be applied to affected systems. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69588 for update details and installation instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T21:18:49.123Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69588","vendor":"Microsoft"}]
Threat ID: 6aa04514acd9273b49fa9672
Added to database: 09/08/2026, 17:25:40 UTC
Last enriched: 10/16/2026, 21:23:13 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 51
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