CVE-2026-86981: Apple macOS Sequoia vulnerability
Published Oct 20, 2026
·Updated
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to cause unexpected system termination.
Affected Software
2 affected components
Apple macOS Sequoia<15.8
Apple macOS Tahoe<26.7
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in macOS Sequoia 15.8 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in macOS Tahoe 26.7
Event History
Oct 20, 2026
CVE Published
via MITRE·12:50 AM
Data Sourced
via MITRE·12:50 AM
DescriptionWeakness
Data Sourced
via NVD·01:17 AM
Description
Frequently Asked Questions
1
Which macOS releases contain the fix?
The issue is fixed in macOS Sequoia 15.8 and macOS Tahoe 26.7.
2
What level of access would an attacker need?
An app may be able to trigger the issue, so exploitation requires the ability to run an application on the affected Mac.
3
What is the reported impact?
Successful exploitation may cause unexpected system termination.