CVE-2026-70155: Windows DNS Denial of Service Vulnerability
Missing release of memory after effective lifetime 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 10.0.14393.9612Patch KB5126868 - 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 6.3.9600.23470Patch KB5126836 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
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 10.0.26100.33650Patch KB5126646
Event History
Frequently Asked Questions
Which systems should be prioritized for review?
Systems running Windows DNS on Microsoft Windows 10 or Windows Server 2012, 2012 R2, 2016, 2019, 2022, or 2025 should be reviewed.
Does exploitation require credentials or user interaction?
No. The vulnerability is described as exploitable by an unauthorized attacker over a network, with no privileges or user interaction required.
What is the expected security impact?
The stated impact is denial of service. The supplied severity vector indicates no confidentiality or integrity impact.