Heap-Based Buffer Overflow in Windows HTTP.sys Affects Microsoft Products
CVE-2026-62811

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 11 Version 23h2
Windows 11 Version 23h2
Windows 11 Version 24h2
Windows 11 Version 25h2
Vendor
CVE Published:
11 August 2026

What is CVE-2026-62811?

A vulnerability in Windows HTTP.sys has been identified that allows an attacker with authorized access to the system to elevate privileges via a heap-based buffer overflow. This flaw can lead to unauthorized access and manipulation of system resources, highlighting the importance of timely system updates and robust security practices. Users are strongly advised to apply the latest patches to mitigate the risk associated with this vulnerability.

Affected Version(s)

Windows 11 version 23H2 ARM64-based Systems 10.0.22631.0 < 10.0.22631.7517

Windows 11 Version 23H2 x64-based Systems 10.0.22631.0 < 10.0.22631.7517

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.9168

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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