CVE-2026-43803: A remote attacker may be able to cause unexpected system termination in Apple iOS and iPadOS
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-43803) involves an out-of-bounds write due to insufficient bounds checking in Apple iOS and iPadOS, which could be exploited remotely to cause unexpected system termination. The issue is addressed by improved bounds checking and fixed in iOS 26.6 and iPadOS 26.6, along with updates to other Apple operating systems. The CVSS 3.1 score of 9.8 reflects critical impact on confidentiality, integrity, and availability. No public exploit is currently known.
Potential Impact
A remote attacker can cause unexpected system termination on affected Apple devices, potentially leading to denial of service and disruption of device availability. The CVSS vector indicates the attack requires no privileges or user interaction and can be performed remotely over the network, with high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
The vulnerability is fixed in iOS 26.6 and iPadOS 26.6. Users and administrators should update affected devices to these versions or later to remediate the issue. Since this is not a cloud service, patching is the primary mitigation. No additional vendor advisory or temporary mitigations are provided.
CVE-2026-43803: A remote attacker may be able to cause unexpected system termination in Apple iOS and iPadOS
Description
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.
CVSS v3.1
Score 9.8critical
Affected software
Apple
iOS and iPadOS
Apple
macOS
Apple
tvOS
Apple
visionOS
Apple
watchOS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-43803) involves an out-of-bounds write due to insufficient bounds checking in Apple iOS and iPadOS, which could be exploited remotely to cause unexpected system termination. The issue is addressed by improved bounds checking and fixed in iOS 26.6 and iPadOS 26.6, along with updates to other Apple operating systems. The CVSS 3.1 score of 9.8 reflects critical impact on confidentiality, integrity, and availability. No public exploit is currently known.
Potential Impact
A remote attacker can cause unexpected system termination on affected Apple devices, potentially leading to denial of service and disruption of device availability. The CVSS vector indicates the attack requires no privileges or user interaction and can be performed remotely over the network, with high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
The vulnerability is fixed in iOS 26.6 and iPadOS 26.6. Users and administrators should update affected devices to these versions or later to remediate the issue. Since this is not a cloud service, patching is the primary mitigation. No additional vendor advisory or temporary mitigations are provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apple
- Date Reserved
- 2026-05-01T22:46:27.821Z
- State
- PUBLISHED
Threat ID: 6a67c1bb9c2644c7f8cb1154
Added to database: 07/27/2026, 20:38:19 UTC
Last enriched: 07/29/2026, 23:54:22 UTC
Last updated: 09/11/2026, 22:08:27 UTC
Views: 49
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