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CVE-2026-33824

Critical CVSS 9.8 Known exploited

Published 2026-04-14 · last changed 2026-08-19 · added to CISA KEV 2026-08-18

This one is being exploited in the wild.

CISA added CVE-2026-33824 to the Known Exploited Vulnerabilities catalog on 2026-08-18. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

Microsoft fixes this in updatesKB5082198, KB5082123, KB5082200, KB5082052, KB5083769, KB5083768, KB5082142, KB5082060, KB5082063. The fixed build differs per Windows version, so the row that matters is the one matching the machine you are looking at.

Windows version Fixed in build Update Released
Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9060 KB5082198 2026-09-20
Windows 10 Version 1607 for x64-based Systems 10.0.14393.9060 KB5082198 2026-09-20
Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8644 KB5082123 2026-09-20
Windows 10 Version 1809 for x64-based Systems 10.0.17763.8644 KB5082123 2026-09-20
Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7184 KB5082200 2026-09-20
Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7184 KB5082200 2026-09-20
Windows 10 Version 21H2 for x64-based Systems 10.0.19044.7184 KB5082200 2026-09-20
Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.7184 KB5082200 2026-09-20
Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.7184 KB5082200 2026-09-20
Windows 10 Version 22H2 for x64-based Systems 10.0.19045.7184 KB5082200 2026-09-20
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.6936 KB5082052 2026-09-20
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.6936 KB5082052 2026-09-20
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8246 KB5083769 2026-09-20
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.8246 KB5083769 2026-09-20
Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8246 KB5083769 2026-09-20
Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8246 KB5083769 2026-09-20
Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.1836 KB5083768 2026-09-20
Windows 11 version 26H1 for x64-based Systems 10.0.28000.1836 KB5083768 2026-09-20
Windows Server 2016 10.0.14393.9060 KB5082198 2026-09-20
Windows Server 2016 (Server Core installation) 10.0.14393.9060 KB5082198 2026-09-20
Windows Server 2019 10.0.17763.8644 KB5082123 2026-09-20
Windows Server 2019 (Server Core installation) 10.0.17763.8644 KB5082123 2026-09-20
Windows Server 2022 10.0.20348.5020 KB5082142 2026-09-20
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2274 KB5082060 2026-09-20
Windows Server 2022 (Server Core installation) 10.0.20348.5020 KB5082142 2026-09-20
Windows Server 2025 10.0.26100.32690 KB5082063 2026-09-20
Windows Server 2025 (Server Core installation) 10.0.26100.32690 KB5082063 2026-09-20

Having the KB is not the same as knowing whether a machine has it. Windows updates supersede each other, so the update you installed often covers a fix that shipped in an earlier one. Paste your build into the patch checker and it walks that chain for you.

What it is

Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.

Sources

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H