CVE-2026-43809
A memory safety bug in macOS lets an attacker read beyond intended memory bounds, which can cause the system to crash. The flaw can be triggered by a malicious application. Apple has released patches in recent macOS releases.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Apple macOS users running versions prior to macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, or macOS Tahoe 26.6.
Real-world impact
An attacker could cause the operating system to terminate unexpectedly, leading to denial of service or enabling further exploitation after the crash.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is network‑exploitable with no authentication or user interaction, and it can compromise confidentiality, integrity, and availability.
What to do about it
- 011. Update your macOS to macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, or macOS Tahoe 26.6, or a later version.
- 022. Restart your computer after the update.
NVD-referenced vendor advisory
Timeline
- Jul 27, 2026 · 3d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 28, 2026 · 2d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
How it’s attacked
References & advisories
- support.apple.com/en-us/128067release notesvendor advisory
- support.apple.com/en-us/128071release notesvendor advisory
- support.apple.com/en-us/128072release notesvendor advisory