CVE-2026-70119
Medium CVSS 6.5Published 2026-10-13 ยท last changed 2026-10-13
The fix
Microsoft fixes this in updatesKB5126655, KB5126646. 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 Server 2022 | 10.0.20348.5761 | KB5126655 | 2026-10-13 |
| Windows Server 2022 (Server Core installation) | 10.0.20348.5761 | KB5126655 | 2026-10-13 |
| Windows Server 2025 | 10.0.26100.33650 | KB5126646 | 2026-10-13 |
| Windows Server 2025 (Server Core installation) | 10.0.26100.33650 | KB5126646 | 2026-10-13 |
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
Out-of-bounds read in Windows DNS allows an authorized attacker to execute code over a network.
Sources
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H