AppleCVE-2026-43748

Apple iOS and iPadOS: out-of-bounds write

CVE-2026-43748 · Published Jul 27, 2026 · updated Sep 14, 2026

Critical9.8

Fix: upgrade to 26.6 or later (3 fixed versions below)

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.

Affected versions

Package	Affected	Fixed in
iOS and iPadOS Product	< 26.6	26.6
macOS Product	< 15.7.8	15.7.8
	< 26.6	26.6

Details and references

CVSS 3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity from: CISA (its enrichment of the CVE record)
Weakness: CWE-787

More Apple advisories

All Apple

Critical 9.8Jul 27

Apple iOS and iPadOS: out-of-bounds writeCVE-2026-64769fixed in 18.7.10 +3 Critical 9.8Jul 27

Apple iOS and iPadOS: out-of-bounds writeCVE-2026-64770fixed in 18.7.10 +3 Critical 9.8Jul 27

Apple iOS and iPadOS: buffer overflowCVE-2026-64771fixed in 18.7.10 +2 Critical 9.8Jul 27

Apple iOS and iPadOS: out-of-bounds writeCVE-2026-64772fixed in 18.7.10 +2 Critical 9.8Jul 27

Apple iOS and iPadOS: integer overflowCVE-2026-64774fixed in 18.7.10 +3 Critical 9.8Jul 27

A memory initialization issue was addressed with improved memory handlingCVE-2026-64775fixed in 26.6 +2