CVE-2026-84543: Connecting to a malicious SMB server may cause unexpected system termination or corrupt kernel memory in Apple macOS
CVE-2026-84543 is a vulnerability in Apple macOS where connecting to a malicious SMB server may cause unexpected system termination or corrupt kernel memory. The issue is due to an out-of-bounds access that has been addressed with improved bounds checking. Fixed versions include macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7.
AI Analysis
Technical Summary
This vulnerability involves an out-of-bounds memory access triggered when macOS connects to a malicious SMB server. The flaw can lead to unexpected system termination or corruption of kernel memory. Apple fixed this issue by improving bounds checking in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7.
Potential Impact
Exploitation of this vulnerability may cause the affected macOS system to crash unexpectedly or experience kernel memory corruption, potentially leading to system instability or denial of service conditions.
Mitigation Recommendations
Apply the official fixes by updating to macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7 or later. These versions include improved bounds checking that resolves the vulnerability.
CVE-2026-84543: Connecting to a malicious SMB server may cause unexpected system termination or corrupt kernel memory in Apple macOS
Description
CVE-2026-84543 is a vulnerability in Apple macOS where connecting to a malicious SMB server may cause unexpected system termination or corrupt kernel memory. The issue is due to an out-of-bounds access that has been addressed with improved bounds checking. Fixed versions include macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7.
Affected software
Apple
macOS
pkg:github/apple/macosRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an out-of-bounds memory access triggered when macOS connects to a malicious SMB server. The flaw can lead to unexpected system termination or corruption of kernel memory. Apple fixed this issue by improving bounds checking in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7.
Potential Impact
Exploitation of this vulnerability may cause the affected macOS system to crash unexpectedly or experience kernel memory corruption, potentially leading to system instability or denial of service conditions.
Mitigation Recommendations
Apply the official fixes by updating to macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7 or later. These versions include improved bounds checking that resolves the vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apple
- Date Reserved
- 2026-09-01T21:13:17.751Z
- State
- PUBLISHED
Threat ID: 6aa8610855bf5e2cf59d298f
Added to database: 09/14/2026, 21:03:04 UTC
Last enriched: 09/14/2026, 22:32:04 UTC
Last updated: 09/15/2026, 03:33:48 UTC
Views: 3
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