{"id":"CVE-2026-86900","title":"An out-of-bounds read issue was addressed with improved input validation","summary":"An out-of-bounds read issue was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27. Mounting a maliciously crafted exFAT volume may cause unexpected system termination or kernel memory disclosure.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","cwe":["CWE-125"],"vendor":"apple","product":"macos","affected":["macos < 27.0"],"patched":["macos 27.0"],"published":"2026-09-14","updated":"2026-09-18","sourceUpdated":"2026-09-18T15:08:46.783","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86900","references":[{"url":"https://support.apple.com/en-us/149035","label":"product-security@apple.com"}],"tags":["nvd","cve.org"],"epss":0.00261,"epssPercentile":0.18238,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T15:37:07.148842Z"},"ingestedAt":"2026-09-14T21:15:17.536Z","slug":"CVE-2026-86900","body":"## Overview\n\nAn out-of-bounds read issue was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27. Mounting a maliciously crafted exFAT volume may cause unexpected system termination or kernel memory disclosure.\n\n## Affected\n\n- `macos < 27.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `macos 27.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":206245,"id":"CVE-2026-86900","ts":1789662143385,"field":"cvss","old":null,"new":"6.5"},{"seq":206244,"id":"CVE-2026-86900","ts":1789662143385,"field":"severity","old":"none","new":"medium"}]}