External risk intelligence

Apple Use After Free System Termination Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-43822

This vulnerability affects local OS components and applications on Apple devices. It requires an app to be installed and running on the device to trigger, and it is not a network-accessible service or edge gateway. It is primarily a client-side execution issue that does not possess a public internet-facing surface.

Use After Free

Apple Ipados

before 26.614.0 to before 14.8.815.0 to before 15.7.826.0 to before 26.6

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A use-after-free vulnerability has been identified, potentially leading to unexpected system termination. This issue affects multiple Apple operating systems, and has been addressed by Apple. The primary concern is to confirm if our environment has exposure to this vulnerability.

Flaw may cause unexpected system termination.
Critical vulnerability impacts widely used Apple systems.
Confirm relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could leverage a malicious app to trigger a use-after-free vulnerability. This flaw could lead to unexpected system termination, potentially impacting the confidentiality, integrity, and availability of the device.

Malicious app installed on device.
Triggering the use-after-free flaw.
System instability and data compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an app to cause unexpected system termination. No specific system data, user data, or sensitive information is indicated as being at risk.

System stability may be affected.
An app could trigger the issue.
Device may crash unexpectedly.

Operational Fix

Recommended remediation, mitigation, and detection steps

The teams responsible for addressing this use-after-free vulnerability likely include device administrators, application owners, and potentially the security operations center. The immediate first step is to identify all Apple devices running affected operating systems, assess their exposure and criticality, and then coordinate remediation efforts.

Device and application owners must address.
Verify device inventory and asset criticality.
Plan coordinated updates during maintenance.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the software affected by CVE-2026-43822?

This vulnerability affects a broad range of Apple operating systems, including iOS, iPadOS, several versions of macOS (Sequoia, Sonoma, Tahoe), tvOS, visionOS, and watchOS. These platforms form the core software environment for Apple's hardware ecosystem, managing system resources, hardware abstraction, and application execution. The update addresses memory management issues within these systems to prevent instability.

How does the Use After Free weakness in CVE-2026-43822 work?

A Use After Free, classified as CWE-416, occurs when software continues to use a memory location after it has been explicitly cleared or freed. This creates a flaw where the system might access incorrect data or allow unauthorized operations in that memory space. In this specific CVE, the memory management error allows an application to manipulate this behavior, which can disrupt normal processes and force an unexpected system termination.

Do I need a specific trigger for this vulnerability to occur?

Yes. This bug is not triggered by simply viewing a web page or receiving a message. It requires a malicious application to be present and actively running on the device to exploit the memory flaw. If no such application is installed, or if the device is not executing code capable of reaching this specific memory management path, the system remains stable.

Is my device at risk based on Halo Surface Signal?

Halo Surface Signal indicates this risk is very unlikely for internet-exposed infrastructure. Because this issue resides in local OS components and requires an app to be installed and running on the device, it does not present a remote, network-accessible attack surface. It is primarily a client-side concern for devices where untrusted third-party software may be executed.

What is the first step to address CVE-2026-43822?

The most effective response is to update your Apple devices to the versions specified in the advisory, such as iOS 26.6, macOS Sequoia 15.7.8, or the relevant version for your specific OS. Before deploying updates, verify your inventory of Apple devices to ensure you have accounted for all hardware running the affected software versions, then prioritize patching based on the devices' access to sensitive data or critical workflows.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.