CVE-2026-64691

A buffer overflow was addressed with improved size validation

Critical · published July 27, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
39.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00468 · 39.5th percentile
Published
2026-07-27T20:14Z
EPSS history
Timeline
  • 27 JUL 20:14Z
    A buffer overflow was addressed with improved size validation
    cvelistv5