Advisoriesby IbisMicrosoftCVE-2026-69631
Microsoft Windows DNS: integer overflow
Fix: upgrade to 10.0.14393.9512 or later (6 fixed versions below)
Integer overflow or wraparound in Windows DNS allows an unauthorized attacker to deny service over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Windows 10 Version 1607 Product | >= 10.0.14393.0, < 10.0.14393.9512 | 10.0.14393.9512 |
| Windows 10 Version 1809 Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2012 Product | >= 6.2.9200.0, < 6.2.9200.26349 | 6.2.9200.26349 |
| Windows Server 2012 (Server Core installation) Product | >= 6.2.9200.0, < 6.2.9200.26349 | 6.2.9200.26349 |
| Windows Server 2012 R2 Product | >= 6.3.9600.0, < 6.3.9600.23398 | 6.3.9600.23398 |
| Windows Server 2012 R2 (Server Core installation) Product | >= 6.3.9600.0, < 6.3.9600.23398 | 6.3.9600.23398 |
| Windows Server 2016 Product | >= 10.0.14393.0, < 10.0.14393.9512 | 10.0.14393.9512 |
| Windows Server 2016 (Server Core installation) Product | >= 10.0.14393.0, < 10.0.14393.9512 | 10.0.14393.9512 |
| Windows Server 2019 Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2019 (Server Core installation) Product | >= 10.0.17763.0, < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2022 Product | >= 10.0.20348.0, < 10.0.20348.5622 | 10.0.20348.5622 |
| Windows Server 2025 Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-190