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CRITICAL · 9.8

CVE-2026-64691

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.

Vulnerability Description

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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
AppleMacos>= 26.0, < 26.6

Related Weaknesses (CWE)

CWE-120

References

FAQ

What is CVE-2026-64691?

CVE-2026-64691 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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.

How severe is CVE-2026-64691?

CVE-2026-64691 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-64691?

Check the references section above for vendor advisories and patch information. Affected products include: Apple Macos.