CVE-2026-43748: An app may be able to cause unexpected system termination in Apple macOS
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-43748) in Apple macOS is caused by an out-of-bounds write condition that was addressed by improved bounds checking. Exploitation of this vulnerability may allow an application to cause unexpected system termination, impacting system availability. The CVSS score of 9.8 reflects its critical severity with network attack vector, no privileges required, and no user interaction needed. The vendor has fixed the issue in macOS Sequoia 15.7.8 and macOS Tahoe 26.6.
Potential Impact
An attacker could exploit this vulnerability remotely without privileges or user interaction to cause a denial of service by triggering unexpected system termination. The impact includes high confidentiality, integrity, and availability loss as indicated by the CVSS vector.
Mitigation Recommendations
The vulnerability is fixed in macOS Sequoia 15.7.8 and macOS Tahoe 26.6. Users and administrators should update to these versions or later to remediate this issue. Patch status is confirmed by the vendor advisory stating these fixed versions. No additional mitigation steps are indicated.
CVE-2026-43748: An app may be able to cause unexpected system termination in Apple macOS
Description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
CVSS v3.1
Score 9.8critical
Affected software
Apple
macOS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-43748) in Apple macOS is caused by an out-of-bounds write condition that was addressed by improved bounds checking. Exploitation of this vulnerability may allow an application to cause unexpected system termination, impacting system availability. The CVSS score of 9.8 reflects its critical severity with network attack vector, no privileges required, and no user interaction needed. The vendor has fixed the issue in macOS Sequoia 15.7.8 and macOS Tahoe 26.6.
Potential Impact
An attacker could exploit this vulnerability remotely without privileges or user interaction to cause a denial of service by triggering unexpected system termination. The impact includes high confidentiality, integrity, and availability loss as indicated by the CVSS vector.
Mitigation Recommendations
The vulnerability is fixed in macOS Sequoia 15.7.8 and macOS Tahoe 26.6. Users and administrators should update to these versions or later to remediate this issue. Patch status is confirmed by the vendor advisory stating these fixed versions. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apple
- Date Reserved
- 2026-05-01T22:46:21.647Z
- State
- PUBLISHED
Threat ID: 6a67c1b59c2644c7f8cb0e83
Added to database: 07/27/2026, 20:38:13 UTC
Last enriched: 07/29/2026, 23:44:38 UTC
Last updated: 09/10/2026, 20:02:22 UTC
Views: 54
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