CVE-2026-83635: Role: DNS Server Denial of Service Vulnerability
Out-of-bounds read in DNS Server allows an unauthorized attacker to deny service over a network.
Other sources
Role: DNS Server 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 6.3.9600.23470Patch KB5126836 - Upgrade
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Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
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Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651
Event History
Frequently Asked Questions
Which systems are exposed to this vulnerability?
The affected products listed are Microsoft Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025. Exposure applies to systems using the DNS Server role.
Does exploitation require authentication or user interaction?
No. The supplied severity vector indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction.
What is the expected impact of a successful attack?
A successful attack can deny DNS service availability. The provided vector indicates no confidentiality or integrity impact.