CVE-2026-20819
Medium CVSS 5.5Published 2026-01-13 ยท last changed 2026-07-30
The fix
Microsoft fixes this in updatesKB5073455, KB5074109. 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 11 Version 23H2 for ARM64-based Systems | 10.0.22631.6491 | KB5073455 | 2026-09-20 |
| Windows 11 Version 23H2 for x64-based Systems | 10.0.22631.6491 | KB5073455 | 2026-09-20 |
| Windows 11 Version 24H2 for ARM64-based Systems | 10.0.26100.7623 | KB5074109 | 2026-09-20 |
| Windows 11 Version 24H2 for x64-based Systems | 10.0.26100.7623 | KB5074109 | 2026-09-20 |
| Windows 11 Version 25H2 for ARM64-based Systems | 10.0.26200.7623 | KB5074109 | 2026-09-20 |
| Windows 11 Version 25H2 for x64-based Systems | 10.0.26200.7623 | KB5074109 | 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
Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.
Sources
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N