CVE-2026-72949 Windows SMB Server Network Transport Driver (srvnet.sys) Denial of Service Vulnerability

High 7.5 Published 8 Sep 2026 Updated 14 Oct 2026

An unauthorized attacker can cause a denial of service in Windows SMB Server via a null pointer dereference in the network transport driver.

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-2026-72949?

CVE-2026-72949 is a high-severity vulnerability in Microsoft Windows 11 23h2, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Null pointer dereference in Windows SMB Server Network Transport Driver (srvnet.sys) allows an unauthorized attacker to deny service over a network.

Weakness: CWE-476

Which versions are affected by CVE-2026-72949?

It affects 6 products.

Products include Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows Server 2022, Microsoft Windows Server 2025.

How do I fix CVE-2026-72949?

No fix has been published for CVE-2026-72949 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-72949 being exploited?

There is no known exploitation of CVE-2026-72949 in the wild and no public exploit code.

All Microsoft Windows 11 23h2 vulnerabilities

Sources

Also known as GHSA-95x5-r679-m6mp.