CVE-2026-43793: An app may be able to cause unexpected system termination in Apple macOS
An issue existed in the handling of environment variables. This issue was addressed with improved validation. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
AI Analysis
Technical Summary
CVE-2026-43793 is a critical vulnerability in Apple macOS where improper validation of environment variables allows an application to cause unexpected system termination. This issue is classified under CWE-20 (Improper Input Validation). Apple has fixed this vulnerability in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6 by improving validation of environment variables to prevent such termination.
Potential Impact
An attacker could exploit this vulnerability to cause a denial of service by triggering unexpected system termination, potentially leading to system instability or downtime. The CVSS score of 9.8 indicates high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
This vulnerability is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Users and administrators should update affected systems to these versions or later to remediate the issue. No additional mitigation steps are indicated.
CVE-2026-43793: An app may be able to cause unexpected system termination in Apple macOS
Description
An issue existed in the handling of environment variables. This issue was addressed with improved validation. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, 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
CVE-2026-43793 is a critical vulnerability in Apple macOS where improper validation of environment variables allows an application to cause unexpected system termination. This issue is classified under CWE-20 (Improper Input Validation). Apple has fixed this vulnerability in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6 by improving validation of environment variables to prevent such termination.
Potential Impact
An attacker could exploit this vulnerability to cause a denial of service by triggering unexpected system termination, potentially leading to system instability or downtime. The CVSS score of 9.8 indicates high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
This vulnerability is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Users and administrators should update affected systems to these versions or later to remediate the issue. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apple
- Date Reserved
- 2026-05-01T22:46:27.820Z
- State
- PUBLISHED
Threat ID: 6a67c1bb9c2644c7f8cb1125
Added to database: 07/27/2026, 20:38:19 UTC
Last enriched: 07/29/2026, 23:54:01 UTC
Last updated: 09/11/2026, 22:06:33 UTC
Views: 41
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