Vulnary
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Critical· 9.8official fix available

CVE-2026-43757

CVE-2026-43757 is a critical out-of-bounds read vulnerability (CWE-125) in macOS that could allow an app to cause unexpected system termination. The flaw is fixed in macOS Sequoia 15.7.8, Sonoma 14.8.8, and Tahoe 26.6.

publishedJul 27, 2026
last modifiedJul 28, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
25th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 27, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Users of macOS Sequoia 15.7.7 or earlier, Sonoma 14.8.7 or earlier, or Tahoe 26.6 or earlier.

02

Real-world impact

Potential system termination if exploited.

03

Why this severity

CVSS 9.8 (critical): High confidence in exploitation leading to severe consequences.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade macOS to version 15.7.8 (Sequoia), 14.8.8 (Sonoma), or 26.6 (Tahoe) or later.
  2. 02Ensure all systems are updated to these specific versions to apply the fix.

NVD-referenced vendor advisory

05

Timeline

  1. Jul 27, 2026 · 3d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 28, 2026 · 2d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →