CVE-2026-105005: Windows Schannel Remote Code Execution Vulnerability
Published Oct 13, 2026
·Updated
Out-of-bounds write in Windows Schannel allows an unauthorized attacker to execute code over a network.
Other sources
Windows Schannel Remote Code Execution Vulnerability
— Microsoft
Affected Software
3 affected componentsFixes available
Microsoft Windows Schannel
Microsoft Windows 11=26H1
10.0.28000.3231
Microsoft Windows 11=26H1
10.0.28000.3231
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 10.0.28000.3231Patch KB5127646
Event History
Oct 13, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·07:01 PM
Data Sourced
via MITRE·07:01 PM
DescriptionSeverity
Data Sourced
via NVD·07:17 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What level of access does an attacker need?
The attack can be conducted over the network by an unauthorized attacker. It requires no privileges or user interaction, but has high attack complexity.
2
Which systems should be prioritized for assessment?
Systems using Microsoft Windows 11 or Microsoft Windows Schannel should be assessed, particularly where Schannel services are reachable over the network.