{"id":"CVE-2026-86901","title":"An out-of-bounds write issue was addressed with improved bounds checking","summary":"An out-of-bounds write issue was addressed with improved bounds checking. 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":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-787"],"vendor":"apple","product":"macos","affected":["macos < 27.0"],"patched":["macos 27.0"],"published":"2026-09-14","updated":"2026-09-18","sourceUpdated":"2026-09-18T16:35:15.753","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86901","references":[{"url":"https://support.apple.com/en-us/149035","label":"product-security@apple.com"}],"tags":["nvd","cve.org"],"epss":0.00124,"epssPercentile":0.0245,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T16:13:16.711448Z"},"ingestedAt":"2026-09-14T21:15:17.514Z","slug":"CVE-2026-86901","body":"## Overview\n\nAn out-of-bounds write issue was addressed with improved bounds checking. 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":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206291,"id":"CVE-2026-86901","ts":1789662167549,"field":"cvss","old":null,"new":"7.1"},{"seq":206290,"id":"CVE-2026-86901","ts":1789662167549,"field":"severity","old":"none","new":"high"}]}