CVE-2026-64691 Memory corruption in macOS

What is CVE-2026-64691?

CVE-2026-64691 is a critical memory corruption vulnerability in Apple Macos, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Tahoe 26.6. An app may be able to cause unexpected system termination.

Weakness: CWE-120

Which versions are affected by CVE-2026-64691?

It affects 1 product.

Products include Apple Macos.

How do I fix CVE-2026-64691?

No fix has been published for CVE-2026-64691 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-2026-64691 being exploited?

There is no known exploitation of CVE-2026-64691 in the wild and no public exploit code.

Other vulnerabilities in Apple Macos

• CVE-2026-65400 Apple macOS Improper Authentication Exploited Critical 9.8
• CVE-2024-44146 Security feature bypass in macOS Critical 10.0
• CVE-2024-44148 Security feature bypass in macOS Critical 10.0
• CVE-2023-38586 Security feature bypass in macOS Critical 10.0
• CVE-2023-40455 Security feature bypass in macOS Critical 10.0

All Apple Macos vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jw76-wr94-p2rj.