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9.8

macOS Tahoe 26.6: Unintended System Termination via Malicious App

CVE-2026-64691 · published 3 months ago
Summary

A previously fixed issue in macOS Tahoe 26.6 could still allow a malicious app to crash the system. This is a concern for users who install untrusted apps. Users should ensure they only install apps from trusted sources.

What to do
  • Update apple macos to version 26.6 or later.
Affected software
VendorProductAffected versions
apple macos < 26.6
>= 26.0, < 26.6
Original advisory text
A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-120Classic Buffer Overflow
Timeline
Published27 Jul 2026
Updated4 Nov 2026
First seen27 Jul 2026
Sources
CVE-2026-64691 · NVD
CVE-2026-64691 · MITRE
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