CVE-2026-43768: Apple macOS denial of service via improper memory handling

Executive brief

A memory handling issue in macOS could allow a malicious application to cause a sudden system crash or shutdown. This affects Apple computers running macOS Sequoia, Sonoma, and Tahoe. While the primary impact is a disruption of service, users are encouraged to update to the latest versions to maintain system stability.

Technical details

A vulnerability exists in macOS due to improper memory handling. A local application can exploit this flaw to trigger an unexpected system termination (denial of service). The issue was addressed by improving memory management logic. Affected versions include macOS Sequoia before 15.7.8, macOS Sonoma before 14.8.8, and macOS Tahoe before 26.6.

Affected products

• Apple macOS Sequoia versions before 15.7.8
• Apple macOS Sonoma versions before 14.8.8
• Apple macOS Tahoe versions before 26.6

Timeline

• 2026-07-27: disclosed
• 2026-07-27: advisory
• 2026-07-27: patched

References

• https://support.apple.com/en-us/128067
• https://support.apple.com/en-us/128071
• https://support.apple.com/en-us/128072