CVE-2026-43773: Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory in Apple macOS
An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory.
AI Analysis
Technical Summary
This vulnerability involves an out-of-bounds read in macOS triggered by mounting a specially crafted disk image. Successful exploitation can lead to unexpected system termination (crash) or corruption of kernel memory, potentially allowing an attacker to compromise system integrity or cause denial of service. Apple has fixed this issue by improving bounds checking in the affected components. The fix is included in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6.
Potential Impact
Exploitation of this vulnerability can cause a system crash or kernel memory corruption, which may lead to denial of service or potentially allow an attacker to execute arbitrary code with kernel privileges. The CVSS score of 9.8 reflects a critical impact on confidentiality, integrity, and availability of the affected systems.
Mitigation Recommendations
A fix is available in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Users and administrators should update to these versions or later to remediate this vulnerability. No other mitigation guidance is provided or required beyond applying the official patches.
CVE-2026-43773: Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory in Apple macOS
Description
An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory.
CVSS v3.1
Score 9.8critical
Affected software
Apple
macOS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an out-of-bounds read in macOS triggered by mounting a specially crafted disk image. Successful exploitation can lead to unexpected system termination (crash) or corruption of kernel memory, potentially allowing an attacker to compromise system integrity or cause denial of service. Apple has fixed this issue by improving bounds checking in the affected components. The fix is included in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6.
Potential Impact
Exploitation of this vulnerability can cause a system crash or kernel memory corruption, which may lead to denial of service or potentially allow an attacker to execute arbitrary code with kernel privileges. The CVSS score of 9.8 reflects a critical impact on confidentiality, integrity, and availability of the affected systems.
Mitigation Recommendations
A fix is available in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6. Users and administrators should update to these versions or later to remediate this vulnerability. No other mitigation guidance is provided or required beyond applying the official patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apple
- Date Reserved
- 2026-05-01T22:46:27.818Z
- State
- PUBLISHED
Threat ID: 6a67c1b99c2644c7f8cb1026
Added to database: 07/27/2026, 20:38:17 UTC
Last enriched: 07/29/2026, 23:53:42 UTC
Last updated: 09/11/2026, 07:31:53 UTC
Views: 48
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