Main Vulnerability Database Vulnerabilities #VU122551

Untrusted Pointer Dereference in Microsoft Windows and Windows Server - CVE-2026-21250

Published: February 10, 2026

Vulnerability identifier: #VU122551

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-21250

CWE-ID: CWE-822

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the target system.

The vulnerability exists due to untrusted pointer dereference in Windows HTTP.sys. A local user can gain elevated privileges on the system.

Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-21250

Install updates from vendor's website.

Microsoft Windows - addressed in versions 11 24H2 10.0.26100.7781, 11 24H2 10.0.26100.7840, 11 26H1 10.0.28000.1575
Windows Server - addressed in versions 2012 R2 6.3.9600.23022, 2022 23H2 10.0.25398.2149, 2025 10.0.26100.32313, 2025 10.0.26100.32370

External References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21250

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