Paper/Archive/CVE-2026-43803

CVE-2026-43803

Apple iOS and iPadOS — An out-of-bounds write issue was addressed with improved bounds checking.

CVSS 9.8 (ADP)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 57.3.573 × 2011.5 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. A remote attacker may be able to cause unexpected system termination.

Affected

ProductAffectedFixed inSource

iOS and iPadOS< 18.7.1018.7.10CNA

iOS and iPadOS< 26.626.6CNA

macOS< 14.8.814.8.8CNA

macOS< 15.7.815.7.8CNA

macOS< 26.626.6CNA

tvOS< 26.626.6CNA

visionOS< 26.626.6CNA

watchOS< 26.626.6CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refsupport.apple.com/en-us/128066 refsupport.apple.com/en-us/128067 refsupport.apple.com/en-us/128068 refsupport.apple.com/en-us/128069 refsupport.apple.com/en-us/128070 refsupport.apple.com/en-us/128071 refsupport.apple.com/en-us/128072 refsupport.apple.com/en-us/148287