CVE-2026-84505 Memory corruption in macOS

High 7.8 Published 14 Sep 2026 Updated 26 Oct 2026

An out-of-bounds write vulnerability in macOS allows a local app to gain root privileges, requiring users to apply the latest security patches.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-84505?

CVE-2026-84505 is a high-severity memory corruption vulnerability in Apple Macos, published on 14 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to gain root privileges.

Weakness: CWE-787

Which versions are affected by CVE-2026-84505?

It affects 1 product.

Products include Apple Macos.

How do I fix CVE-2026-84505?

No fix has been published for CVE-2026-84505 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-2026-84505 being exploited?

There is no known exploitation of CVE-2026-84505 in the wild and no public exploit code.

All Apple Macos vulnerabilities

Sources

Also known as GHSA-85f4-mm6j-54x7.