CVE-2026-42974 Windows Performance Monitor Remote Code Execution Vulnerability

High 8.1 Published 9 Jun 2026 Updated 24 Sep 2026

An integer overflow in Windows Performance Monitor 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-2026-42974?

CVE-2026-42974 is a high-severity vulnerability in Microsoft Windows 11 23h2, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Integer overflow or wraparound in Windows Performance Monitor allows an unauthorized attacker to execute code over a network.

Weakness: CWE-190

Which versions are affected by CVE-2026-42974?

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-2026-42974?

No fix has been published for CVE-2026-42974 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-42974 being exploited?

There is no known exploitation of CVE-2026-42974 in the wild and no public exploit code.

All Microsoft Windows 11 23h2 vulnerabilities

Sources

Also known as GHSA-j6cc-qpjj-g659.