CVE-2026-84543 Apple macOS - Denial of Service

Apple macOS Golden Gate 27, Sequoia 15.8, and Tahoe 26.7 contain a denial of service caused by out-of-bounds access in SMB client, letting attackers cause system termination or kernel memory corruption, exploit requires connecting to a malicious SMB server.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.43% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-125

Vendor fix

Update to macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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