CVE-2026-88130: Role: DNS Server Denial of Service Vulnerability
Out-of-bounds read in DNS Server allows an authorized 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
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651 - 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 6.2.9200.26434Patch KB5126835 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
Systems running the DNS Server role on Microsoft Windows Server 2012, 2012 R2, 2016, 2019, 2022, or 2025 are in scope. The issue affects the DNS Server component rather than every Windows Server installation.
What does an attacker need to exploit it?
The attacker needs network access and low privileges as an authorized user. No user interaction is required.
What is the expected impact of successful exploitation?
Successful exploitation can cause a denial of service affecting the DNS Server's availability. The supplied severity vector indicates no confidentiality or integrity impact.