CVE intelligence

CVE-2026-84520

Vulnerability intelligence

Published Sep 14, 2026Sources checked Sep 28, 2026

9.8CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-84520 and is rated Critical severity with a CVSS score of 9.8. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.4%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-84520?

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.