CVE-2026-105005 Windows Schannel Remote Code Execution Vulnerability

High 8.1 Published 13 Oct 2026 Updated 29 Oct 2026

An out-of-bounds write in Windows Schannel allows remote attackers to execute arbitrary code without authentication.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-105005?

CVE-2026-105005 is a high-severity memory corruption vulnerability in Microsoft Windows 11 26h1, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

Weakness: CWE-787

Which versions are affected by CVE-2026-105005?

It affects 1 product.

Products include Microsoft Windows 11 26h1.

How do I fix CVE-2026-105005?

No fix has been published for CVE-2026-105005 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-105005 being exploited?

There is no known exploitation of CVE-2026-105005 in the wild and no public exploit code.

All Microsoft Windows 11 26h1 vulnerabilities

Sources

Also known as GHSA-cmg6-qx67-w59c.