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CVE-2026-84543

HighPublished

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...

Published: Sep 14, 2026
Updated: Sep 15, 2026
Assigning CNA: apple
Evidence observed: Sep 24, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 26.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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 corrupt kernel memory.

Sources

CVE-2026-84543PoC
Proof-of-concept and technical disclosure for CVE-2026-84543, a macOS SMB kernel vulnerability that triggers kernel panic via crafted SMB1 responses.

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