CVE-2026-97830: Windows Internet Information Services Denial of Service Vulnerability
Double free in Windows Internet Information Services allows an unauthorized attacker to deny service over a network.
Other sources
Windows Internet Information Services 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 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655
Event History
Frequently Asked Questions
Who can exploit this issue?
An unauthorized attacker can exploit it remotely over the network. No privileges or user interaction are required according to the supplied vector.
What is the expected impact of a successful attack?
A successful exploit can deny service by triggering a double-free condition in Internet Information Services. The provided metrics indicate no confidentiality or integrity impact, with impact limited to availability.
Which systems should be prioritized for review?
Review deployments using Microsoft Internet Information Services on Microsoft Windows 11, Windows Server 2022, or Windows Server 2025. Systems that expose IIS network services are the relevant attack surface.