CVE-2026-43774 Memory corruption in macOS

Medium 5.5 Published 27 Jul 2026 Updated 28 Jul 2026

An out-of-bounds read in macOS allows an app to access sensitive user data, requiring a system update to fix.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-43774?

CVE-2026-43774 is a medium-severity memory corruption vulnerability in Apple Macos, published on 27 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to access sensitive user data.

Weakness: CWE-787

Which versions are affected by CVE-2026-43774?

It affects 1 product.

Products include Apple Macos.

How do I fix CVE-2026-43774?

No fix has been published for CVE-2026-43774 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-2026-43774 being exploited?

There is no known exploitation of CVE-2026-43774 in the wild and no public exploit code.

All Apple Macos vulnerabilities

Sources

Also known as GHSA-jg6m-x829-8jxm.