CVE-2026-62811: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 version 23H2
Heap-based buffer overflow in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability involves a heap-based buffer overflow in the Windows HTTP.sys driver in Windows 11 version 23H2 (build 10.0.22631.0). An authorized attacker with local access can exploit this flaw to elevate their privileges, potentially gaining higher-level system permissions. The vulnerability is tracked as CWE-122 and has been assigned CVE-2026-62811. Microsoft has published an official fix to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate their privileges, potentially leading to full system compromise. The impact includes high confidentiality, integrity, and availability consequences as indicated by the CVSS vector.
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-2026-62811 to remediate this vulnerability.
CVE-2026-62811: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 version 23H2
Description
Heap-based buffer overflow in Windows HTTP.sys 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 involves a heap-based buffer overflow in the Windows HTTP.sys driver in Windows 11 version 23H2 (build 10.0.22631.0). An authorized attacker with local access can exploit this flaw to elevate their privileges, potentially gaining higher-level system permissions. The vulnerability is tracked as CWE-122 and has been assigned CVE-2026-62811. Microsoft has published an official fix to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate their privileges, potentially leading to full system compromise. The impact includes high confidentiality, integrity, and availability consequences as indicated by the CVSS vector.
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-2026-62811 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-14T21:08:07.966Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62811","vendor":"Microsoft"}]
Threat ID: 6a7b581abf8831d53915602c
Added to database: 08/11/2026, 17:12:58 UTC
Last enriched: 08/11/2026, 21:27:36 UTC
Last updated: 08/12/2026, 02:41:15 UTC
Views: 3
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