CVE-2026-50399: CWE-125: Out-of-bounds Read in Microsoft Windows 10 Version 21H2
Out-of-bounds read in Windows Kernel allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability, identified as CVE-2026-50399 and classified under CWE-125 (Out-of-bounds Read), affects the Windows Kernel in Windows 10 Version 21H2 (build 10.0.19044.0). It permits an authorized local attacker to perform an out-of-bounds read, which can lead to privilege escalation. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows a local attacker with authorized access to elevate their privileges on the affected system, potentially gaining higher-level access and control. The vulnerability impacts confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50399 to remediate this vulnerability.
CVE-2026-50399: CWE-125: Out-of-bounds Read in Microsoft Windows 10 Version 21H2
Description
Out-of-bounds read in Windows Kernel allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-50399 and classified under CWE-125 (Out-of-bounds Read), affects the Windows Kernel in Windows 10 Version 21H2 (build 10.0.19044.0). It permits an authorized local attacker to perform an out-of-bounds read, which can lead to privilege escalation. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows a local attacker with authorized access to elevate their privileges on the affected system, potentially gaining higher-level access and control. The vulnerability impacts confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50399 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-04T18:56:53.258Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50399","vendor":"Microsoft"}]
Threat ID: 6a56769868715ace43f08e71
Added to database: 07/14/2026, 17:49:12 UTC
Last enriched: 08/13/2026, 14:47:40 UTC
Last updated: 08/28/2026, 22:52:11 UTC
Views: 50
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