External risk intelligence

Apple Use After Free Vulnerability Leads to Unexpected App Termination

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-64700

This vulnerability affects client-side operating systems (iOS, macOS, tvOS, watchOS, visionOS). These are end-user devices, not network-facing servers, gateways, or edge services. The exposure is limited to local device operations and app execution, making public internet-facing exploitation via the device's role as a network service very unlikely.

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 recently identified use-after-free vulnerability in Apple operating systems could allow an application to unexpectedly terminate the system. This critical issue impacts a broad range of Apple devices and warrants review to confirm relevance and exposure within your environment.

An app could crash the system.
Remember this for broad Apple device exposure.
Confirm if your Apple devices are affected.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending crafted data to a device over the network. This could be achieved through a malicious app or a specially designed web content, potentially leading to unexpected system termination or other unintended behaviors.

Entry condition: Network access to the affected device.
Trigger point: Processing specially crafted data.
Resulting risk: Unexpected system termination.

Live Threat

Current exploitation, exposure, and threat context

A use-after-free vulnerability could allow an application to terminate the system unexpectedly. This could potentially lead to system instability when an app is running.

System stability and availability.
Through unexpected system termination.
Interruption of device operation.

Operational Fix

Recommended remediation, mitigation, and detection steps

Platform teams and system owners for Apple devices are likely responsible for addressing this vulnerability. The first practical step is to identify all affected devices, confirm their business criticality and network reachability, and then assign ownership to the appropriate team for remediation planning.

Confirm device ownership and exposure.
Verify if devices are business-critical.
Plan remediation based on risk.

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-2026-64700?

This vulnerability impacts core Apple operating systems, including iOS, iPadOS, macOS (Sequoia, Sonoma, and Tahoe), tvOS, visionOS, and watchOS. These platforms power a wide range of devices—from phones and tablets to desktop computers, smart TVs, and wearable technology—that rely on complex memory management to run applications and process data securely.

What does a use-after-free vulnerability mean?

A use-after-free (CWE-416) is a memory management error. It occurs when software continues to use a pointer to a memory location after that memory has been cleared or released. Because the system expects that memory to be free for other tasks, accessing it again can lead to data errors or, as seen in this CVE, trigger an unexpected system termination that forces the application or device to stop functioning.

How is this vulnerability triggered?

The issue is triggered when an affected device processes specially crafted data provided via the network. This can occur through the use of a malicious application or by viewing manipulated web content. It is important to note that standard, legitimate interactions with healthy applications or safe websites do not trigger this memory error; the condition requires specific, malicious data inputs designed to exploit the flawed memory reference.

Who should be concerned about CVE-2026-64700?

Owners of Apple devices should be aware of this issue, though Halo Surface Signal notes that public internet-facing exploitation is very unlikely. Because these operating systems primarily run on end-user hardware rather than network-facing infrastructure like servers or gateways, the risk is largely tied to individual device usage and the specific apps or content users interact with on their personal or professional machines.

What should I do if I use these Apple devices?

Start by identifying all devices in your inventory that are running the affected operating system versions. Prioritize those that are used for critical business tasks or handle sensitive information. Once identified, coordinate with the appropriate teams to ensure these devices are updated to the patched versions—such as iOS 26.6, macOS Sequoia 15.7.8, or the relevant update for your specific platform—to resolve the underlying memory management flaw.

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.