CVE-2026-34332 Windows Kernel-Mode Driver Remote Code Execution Vulnerability

High 8.0 Published 12 May 2026 Updated 10 Aug 2026

An authorized attacker can execute code remotely via a use-after-free flaw in Windows Kernel-Mode Drivers.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-34332?

CVE-2026-34332 is a high-severity use after free vulnerability in Microsoft Windows Server 2025, published on 12 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.

Weakness: CWE-416

Which versions are affected by CVE-2026-34332?

It affects 1 product.

Products include Microsoft Windows Server 2025.

How do I fix CVE-2026-34332?

No fix has been published for CVE-2026-34332 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2026-34332 being exploited?

There is no known exploitation of CVE-2026-34332 in the wild and no public exploit code.

All Microsoft Windows Server 2025 vulnerabilities

Sources

Also known as GHSA-qj47-r3gf-wx2h.