CVE-2026-21250: Windows HTTP.sys Elevation of Privilege Vulnerability

Published Feb 10, 2026
·
Updated

Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

Other sources

Windows HTTP.sys Elevation of Privilege Vulnerability

— Microsoft

Affected Software

15 affected componentsFixes available
Microsoft Windows 11=26H1
Patch available
Microsoft Windows 11=24H2
Patch availablePatch available
Microsoft Windows Server 2025
Patch availablePatch available
Microsoft Windows 11=25H2
Patch availablePatch available
Microsoft Windows 11=24H2
Patch availablePatch available
Microsoft Windows 11=26H1
Patch available
Microsoft Windows Server 2025
Patch availablePatch available
Microsoft Windows 11=25H2
Patch availablePatch available
Microsoft Windows Server 2022, 23H2 Edition
Patch available
Microsoft Windows 11 24h2<10.0.26100.7781
Microsoft Windows 11 24h2<10.0.26100.7781
Microsoft Windows 11 25h2<10.0.26200.7781
Microsoft Windows 11 25h2<10.0.26200.7781
Microsoft Windows Server 2022 23h2<10.0.25398.2149
Microsoft Windows Server 2025<10.0.26100.32313

Event History

Feb 10, 2026
CVE Published
via Microsoft·04:00 PM
Data Sourced
via Microsoft·04:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·04:00 PM
Affected Software
Updated
via Microsoft·04:00 PM
Description
CVE Published
via MITRE·05:51 PM
Data Sourced
via MITRE·05:51 PM
DescriptionSeverity
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software
May 4, 2026
Exploit Published
via ExploitDB·12:00 AM
Known Exploited
04:44 PM
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Frequently Asked Questions

1

What is the severity of CVE-2026-21250?

CVE-2026-21250 has a high severity rating due to its potential for local privilege escalation.

2

How do I fix CVE-2026-21250?

To fix CVE-2026-21250, apply the appropriate security patches provided by Microsoft for your specific Windows version.

3

What operating systems are affected by CVE-2026-21250?

CVE-2026-21250 affects various versions of Microsoft Windows 11 and Windows Server 2025.

4

Can CVE-2026-21250 be exploited remotely?

No, CVE-2026-21250 requires local access, making it a local privilege escalation vulnerability.

5

Who is at risk for CVE-2026-21250?

Users and administrators of affected Windows systems are at risk if not patched against CVE-2026-21250.

Company

Resources

Contact

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