CVE-2026-42981: CWE-191: Integer Underflow (Wrap or Wraparound) in Microsoft Windows 11 version 23H2
Integer underflow (wrap or wraparound) in Windows Performance Monitor allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-191 (Integer Underflow), exists in the Windows Performance Monitor of Windows 11 version 23H2 (build 10.0.22631.0). An integer underflow condition can be triggered remotely, enabling an attacker without privileges or user interaction to execute arbitrary code on the affected system. The vulnerability is rated with a CVSS 3.1 base score of 8.1, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability allows remote code execution without requiring user interaction or privileges, potentially leading to full system compromise. Confidentiality, integrity, and availability of the affected system are all impacted at a high level.
Mitigation Recommendations
An official fix is available from Microsoft. It is strongly recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42981 to remediate this vulnerability.
CVE-2026-42981: CWE-191: Integer Underflow (Wrap or Wraparound) in Microsoft Windows 11 version 23H2
Description
Integer underflow (wrap or wraparound) in Windows Performance Monitor allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 8.1high
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-191 (Integer Underflow), exists in the Windows Performance Monitor of Windows 11 version 23H2 (build 10.0.22631.0). An integer underflow condition can be triggered remotely, enabling an attacker without privileges or user interaction to execute arbitrary code on the affected system. The vulnerability is rated with a CVSS 3.1 base score of 8.1, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability allows remote code execution without requiring user interaction or privileges, potentially leading to full system compromise. Confidentiality, integrity, and availability of the affected system are all impacted at a high level.
Mitigation Recommendations
An official fix is available from Microsoft. It is strongly recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42981 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-30T23:43:50.745Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42981","vendor":"Microsoft"}]
Threat ID: 6a284cc88dd33fbd856648e5
Added to database: 06/09/2026, 17:26:32 UTC
Last enriched: 08/14/2026, 13:22:34 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 94
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