Untrusted Pointer Dereference in Windows HTTP.sys by Microsoft
CVE-2026-21250

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2025 (server Core Installation)
Windows 11 Version 25h2
Windows Server 2022, 23h2 Edition (server Core Installation)
Windows 11 Version 24h2
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21250?

A vulnerability in Windows HTTP.sys allows an authorized attacker to exploit an untrusted pointer dereference, leading to potential local privilege escalation. This flaw can be used by attackers with existing access to execute arbitrary code at higher privilege levels, which may compromise system integrity and control.

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Affected Version(s)

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.7840

Windows 11 Version 25H2 10.0.26200.0 < 10.0.26200.7840

Windows 11 Version 26H1 10.0.28000.0 < 10.0.28000.1575

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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