CVE-2026-72940: Windows Schannel Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Schannel allows an unauthorized attacker to execute code over a network.
Other sources
Windows Schannel Remote Code Execution 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 10.0.26100.33438Patch KB5122871 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9445Patch KB5124008 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7582Patch KB5122880 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9445Patch KB5124008 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.2954Patch KB5124012
Event History
Frequently Asked Questions
Which environments are identified as affected?
The listed affected software is Microsoft Windows 11, Microsoft Windows Server 2025, and Microsoft Windows Server 2022.
Does exploitation require attacker authentication or user interaction?
The supplied CVSS vector indicates no attacker privileges are required (PR:N), but user interaction is required (UI:R).