7.8
High
CVE-2026-21232 Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally
Description
Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 11 version 26H1 10.0 | 10.0.28000.0 → < 10.0.28000.1575 | 10.0.28000.1575 |
| Windows Server 2025 (Server Core installation) 10.0 | 10.0.26100.0 → < 10.0.26100.32370 | 10.0.26100.32370 |
| Windows 11 Version 25H2 10.0 | 10.0.26200.0 → < 10.0.26200.7840 | 10.0.26200.7840 |
| Windows 11 version 22H3 10.0 | 10.0.22631.0 → < 10.0.22631.6649 | 10.0.22631.6649 |
| Windows 11 Version 23H2 10.0 | 10.0.22631.0 → < 10.0.22631.6649 | 10.0.22631.6649 |
| Windows Server 2022, 23H2 Edition (Server Core installation) 10.0 | 10.0.25398.0 → < 10.0.25398.2149 | 10.0.25398.2149 |
| Windows 11 Version 24H2 10.0 | 10.0.26100.0 → < 10.0.26100.7840 | 10.0.26100.7840 |
| Windows Server 2025 10.0 | 10.0.26100.0 → < 10.0.26100.32370 | 10.0.26100.32370 |
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