External risk intelligence

Apple Operating System Memory Initialization Flaw Leads to System Termination

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-64775

The vulnerability affects client-side operating systems and end-user devices (iOS, iPadOS, macOS, tvOS, visionOS, watchOS). These systems are typically used as personal computing or consumer devices rather than internet-facing servers, gateways, or public-facing infrastructure, making them very unlikely to be exposed as a public-facing attack surface.

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 memory initialization issue has been identified in Apple operating systems that could allow an application to cause unexpected system termination. This vulnerability is addressed in the latest updates for iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.

Uninitialized memory could crash systems.
Confirm if affected Apple devices are in use.
Understand potential impact on device stability.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted data to a vulnerable application over the network. This could potentially lead to an unexpected system termination, impacting the availability of the device.

No privileges or user interaction required.
Triggered by sending malformed data to an app.
Potential for unexpected system termination.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an app to terminate the system unexpectedly. It does not appear to expose system data, user data, or sensitive information.

System stability could be affected.
An app could cause unexpected termination.
Device may become unresponsive.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability affects Apple client operating systems, meaning device owners and the platform teams managing those devices are likely responsible for addressing it. The first practical step is to identify all devices running the affected operating systems, confirm if they are business-critical, and then plan remediation based on risk and user impact.

Device owners and platform teams own remediation.
Verify affected devices and business criticality.
Plan risk-based updates and user communication.

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-2026-64775?

This vulnerability affects a broad range of Apple platforms, including iOS, iPadOS, macOS (Sequoia, Sonoma, and Tahoe), tvOS, visionOS, and watchOS. These operating systems provide the core infrastructure for Apple's consumer ecosystem, powering everything from mobile devices and wearables to desktop computers and spatial computing headsets.

How does this memory initialization issue cause a crash?

CVE-2026-64775 is categorized as CWE-665, which refers to improper initialization. In this context, the system fails to correctly set up memory segments before use. When an application encounters this uninitialized data, it causes the system to malfunction, leading to an unexpected termination or sudden stop of the device's operating system.

Can any data trigger this system termination?

The flaw is triggered when an application processes specifically crafted, malformed data sent over a network. It is important to note that the issue resides in how the system handles memory initialization; simply using the device for standard tasks or receiving benign, well-formed network traffic does not activate this specific vulnerability.

Do I need to worry about this on my internal network?

Halo Surface Signal notes that because these are primarily consumer or personal computing devices, they are generally not used as internet-facing servers. While the vulnerability can technically be reached via a network, the risk profile is lower compared to public-facing infrastructure. The primary concern is localized system instability rather than broad, internet-scale exposure.

When should I prioritize updating my Apple devices?

Your first step should be to audit your device inventory to identify systems running versions earlier than those released in the latest Apple updates. Since this bug impacts overall system availability, prioritize devices that are critical to daily business operations or user productivity. Once identified, schedule the updates to restore system stability and ensure continued reliability.

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.