{"id":"CVE-2026-84520","title":"A buffer overflow was addressed with improved size validation","summary":"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.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-120"],"vendor":"apple","product":"macos","affected":["macos < 27.0"],"patched":["macos 27.0"],"published":"2026-09-14","updated":"2026-09-16","sourceUpdated":"2026-09-16T17:14:37.690","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84520","references":[{"url":"https://support.apple.com/en-us/149035","label":"product-security@apple.com"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00445,"epssPercentile":0.38484,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-16T14:35:41.940952Z"},"ingestedAt":"2026-09-14T21:15:17.539Z","exploits":{"github":1,"githubRepos":["https://github.com/csrXamfi/CVE-2026-84520"],"checkedAt":"2026-10-27T19:17:22.553Z"},"exploitAvailable":true,"slug":"CVE-2026-84520","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `macos < 27.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `macos 27.0`","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":219389,"id":"CVE-2026-84520","ts":1791813163033,"field":"exploit_available","old":"false","new":"true"},{"seq":205286,"id":"CVE-2026-84520","ts":1789570706160,"field":"cvss","old":null,"new":"9.8"},{"seq":205285,"id":"CVE-2026-84520","ts":1789570706160,"field":"severity","old":"none","new":"critical"}]}