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CVE-2026-105005: Windows Schannel Remote Code Execution Vulnerability

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-31
• Weakness: CWE-787

Description

Out-of-bounds write in Windows Schannel allows an unauthorized attacker to execute code over a network.

Affected products

• Microsoft Windows 11 version 26H1: before 10.0.28000.3231 — fixed in 10.0.28000.3231
• Microsoft Windows 11 version 26H1: from 10.0.28000.0 before 10.0.28000.3231 — fixed in 10.0.28000.3231

How to fix

Upgrade to a fixed version: Microsoft Windows 11 version 26H1 10.0.28000.3231; Microsoft Windows 11 version 26H1 10.0.28000.3231. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105005

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