CVE-2026-84520 Memory corruption in macOS
A local attacker can exploit a buffer overflow in macOS to cause system termination or corrupt kernel memory, potentially leading to privilege escalation.
- 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-2026-84520?
CVE-2026-84520 is a critical memory corruption vulnerability in Apple Macos, published on 14 Sep 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 Golden Gate 27. A local attacker may be able to cause unexpected system termination or corrupt kernel memory.
Weakness: CWE-120
Which versions are affected by CVE-2026-84520?
It affects 1 product.
Products include Apple Macos.
How do I fix CVE-2026-84520?
No fix has been published for CVE-2026-84520 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-2026-84520 being exploited?
There is no known exploitation of CVE-2026-84520 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Apple Macos
Sources
Also known as GHSA-ggcw-m5qm-2p57.