Critical severity · published Jul 27, 2026
CVE-2026-43748
An out-of-bounds write issue was addressed with improved bounds checking
9.8
CVSS
0.6%
EPSS
No
On KEV
Description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
macOS · Apple
before 15.7.8; before 26.6 · source: vendor, NVD
IA
iOS and iPadOS · Apple
before 26.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43748
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43748
support.apple.com
https://support.apple.com/en-us/128066
Release Notes
https://support.apple.com/en-us/128067
Release Notes
https://support.apple.com/en-us/128071
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