CVE-2026-69631: Windows DNS Denial of Service Vulnerability
Integer overflow or wraparound in Windows DNS allows an unauthorized attacker to deny service over a network.
Other sources
Windows DNS Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9512Patch KB5123099 - Upgrade
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Fixed in 6.3.9600.23397Patch KB5123066 - Upgrade
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Fixed in 6.2.9200.26349Patch KB5123065 - Upgrade
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Fixed in 10.0.17763.9245Patch KB5122876 - Upgrade
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Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33438Patch KB5122871
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
The affected products listed are Microsoft Windows 10 and Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. Exposure is relevant where the Windows DNS component is reachable over the network.
Does exploitation require authentication or user interaction?
No. The supplied vector indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction required.
What is the expected impact of a successful attack?
A successful attack can deny service through an integer overflow or wraparound in Windows DNS. The provided impact metrics indicate availability impact only, with no stated confidentiality or integrity impact.