CVE-2026-84515 Apple macOS - Out of Bounds Write

Apple macOS Golden Gate 27, Sequoia 15.8, and Tahoe 26.7 contain an out-of-bounds write caused by insufficient bounds checking in SMB client, letting attackers cause kernel memory corruption by connecting to a malicious SMB server.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Write
Impact
Denial Of Service, Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to macOS Golden Gate 27, Sequoia 15.8, 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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