CVE-2026-84543
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk26th percentile - higher than 26% of all known CVEs
Summary
An out-of-bounds access issue in SMB connection handling, addressed with improved bounds checking. The flaw affects macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. Connecting to a malicious SMB server may cause unexpected system termination or corrupt kernel memory.
Risk Assessment
An attacker controlling an SMB server may cause system termination or kernel memory corruption on the client machine. This can result in denial of service or potential kernel-level code execution.
Recommendation
Update macOS to Golden Gate 27, Sequoia 15.8, or Tahoe 26.7. Restrict connections to untrusted SMB shares and enforce SMB signing and encryption.
Other vulnerabilities in Apple macOS
See all- CVE-2026-84520Critical
A buffer overflow vulnerability in macOS Golden Gate, fixed by improved size validation. A local attacker may be able to cause unexpected system termination or corrupt kernel memory.
- CVE-2026-43790Critical
The issue was addressed with improved memory handling. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. A remote attacker may be able to cause unexpected system termination or corrupt kernel memory.
- CVE-2026-64767Critical
A buffer overflow vulnerability in macOS allows a remote attacker to cause unexpected system termination or corrupt kernel memory.
- CVE-2026-64731Critical
Path validation was improved. The issue affects macOS Sequoia 15.7.8 and macOS Tahoe 26.6. A malicious app may be able to break out of its sandbox.
- CVE-2026-64704Critical
A type confusion issue was addressed with improved memory handling. The fix is included in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
- CVE-2026-64703Critical
A use after free issue was addressed with improved memory management. The fix is included in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. An app may be able to cause a denial-of-service.
- CVE-2026-64702Critical
An access issue was addressed with additional sandbox restrictions. The fix is included in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. An app may be able to break out of its sandbox.
- CVE-2026-64698Critical
A memory handling issue was fixed with improved memory management. The vulnerability affects macOS systems. An app may cause unexpected system termination or read kernel memory.
- CVE-2026-64697Critical
A memory handling issue was fixed with improved memory management. The vulnerability affects macOS systems. An app may cause unexpected system termination or corrupt kernel memory.
- CVE-2026-64696Critical
A memory handling issue was fixed with improved memory management. The vulnerability affects macOS systems. A remote user may cause unexpected system termination or corrupt kernel memory.
Original NVD description (English source)
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 corrupt kernel memory.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS