Overview
CVE-2026-28911 is a critical memory safety vulnerability in macOS with a CVSS base score of 9.8. The flaw exists in how macOS handles memory operations for system processes, and can be exploited by a malicious application to corrupt memory of a system process — potentially leading to privilege escalation, arbitrary code execution, or system instability.
Apple addressed the vulnerability through improved memory handling routines.
Affected Systems
| Product | Fixed Version |
|---|---|
| macOS Sonoma | 14.8.8 |
| macOS Tahoe | 26.6 |
Technical Details
The issue stems from insufficient memory safety checks during specific inter-process operations. By crafting a malicious application, an attacker who has already achieved code execution on a target device can trigger the memory corruption condition to escalate privileges or disrupt critical system services.
The vulnerability is classified as a memory corruption issue — one of the most exploitable bug classes on Apple platforms. Apple's advisory notes the issue was addressed with "improved memory handling."
Risk Assessment
- CVSS Score: 9.8 (Critical)
- Attack Vector: Local (requires a malicious app to be installed and run)
- Impact: System process memory corruption — potential privilege escalation or crash
- Exploit Status: No public exploit reported at time of disclosure
Recommended Actions
- Update macOS immediately to Sonoma 14.8.8 or Tahoe 26.6 via System Settings → General → Software Update
- Restrict app installations to trusted sources (Mac App Store or verified developers with notarization)
- Review endpoint security policies to ensure only authorized applications run on managed devices
- Monitor for unusual process crashes or unexpected privilege changes as indicators of exploitation attempts
References
- NVD Entry — CVE-2026-28911
- Apple Security Updates (macOS Sonoma 14.8.8, macOS Tahoe 26.6)