{"id":"CVE-2026-84543","title":"An out-of-bounds access issue was addressed with improved bounds checking","summary":"An out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may cause unexpected system termination or…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-125"],"vendor":"apple","product":"macos","affected":["macos >= 15.0, < 15.8","macos >= 26.0, < 26.7"],"patched":["macos 26.7"],"published":"2026-09-14","updated":"2026-09-16","sourceUpdated":"2026-09-16T14:47:51.130","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84543","references":[{"url":"https://support.apple.com/en-us/149035","label":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/149042","label":"product-security@apple.com"},{"url":"https://support.apple.com/en-us/149043","label":"product-security@apple.com"}],"tags":["nvd","cve.org"],"epss":0.00333,"epssPercentile":0.2672,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-15T18:12:24.680753Z"},"ingestedAt":"2026-09-14T21:15:17.470Z","slug":"CVE-2026-84543","body":"## Overview\n\nAn out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may cause unexpected system termination or corrupt kernel memory.\n\n## Affected\n\n- `macos >= 15.0, < 15.8`\n- `macos >= 26.0, < 26.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `macos 26.7`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":204435,"id":"CVE-2026-84543","ts":1789497768866,"field":"cvss","old":null,"new":"7.5"},{"seq":204434,"id":"CVE-2026-84543","ts":1789497768866,"field":"severity","old":"none","new":"high"}]}