External risk intelligence

Buffer Overflow in Apple Operating Systems Leads to Application Termination or Heap Corruption

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-64771

The vulnerability affects consumer operating systems (iOS, iPadOS, macOS, tvOS, visionOS) and involves local application processing. These products are end-user devices, not internet-facing infrastructure services or gateways, and are typically not exposed as public-facing services in common deployments.

Memory Corruption

Apple Ipados

before 26.615.0 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 buffer overflow vulnerability has been addressed in Apple's operating systems, potentially allowing remote attackers to cause application termination or data corruption. While this issue has been fixed in recent updates, the main concern is confirming its relevance and exposure within our environment.

Unexpected application termination or data corruption possible.
Crucial to verify if our systems are affected.
Confirm relevance and exposure for systems.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted data over the network to a vulnerable application. This could lead to unexpected application termination or heap corruption, potentially allowing for further compromise.

No special access required.
Triggered by network data.
Risks: application crash, data corruption.

Live Threat

Current exploitation, exposure, and threat context

A remote attacker could exploit this vulnerability to cause application termination or heap corruption. This occurs when an application is unable to properly handle data, potentially leading to a crash or unpredictable behavior. The advisory does not indicate that sensitive information or personal data is exposed.

Application stability and integrity.
Unexpected application termination or heap corruption.
Disruption of service or unexpected behavior.

Operational Fix

Recommended remediation, mitigation, and detection steps

Platform and device owners are responsible for managing operating system updates on their managed devices. The initial step is to identify all devices running the affected operating systems, confirm their reachability and business criticality, and then plan remediation based on the identified risk.

Identify affected device owners.
Verify device reachability and criticality.
Plan OS updates 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-2026-64771?

This vulnerability impacts several Apple operating systems, including iOS, iPadOS, macOS Sequoia, macOS Tahoe, tvOS, and visionOS. These platforms serve as the foundation for Apple's consumer devices, such as iPhones, iPads, Macs, Apple TV, and the Apple Vision Pro, enabling users to run a wide range of mobile, desktop, and spatial computing applications.

What does this buffer overflow vulnerability mean?

The vulnerability is categorized as CWE-119, which refers to Improper Restriction of Operations within the Bounds of a Memory Buffer. In plain terms, the software fails to properly check the size of incoming data. If a program attempts to write more data into a memory space than it is designed to hold, it overflows into adjacent memory, potentially causing the application to crash or corrupting memory structures.

How can an attacker trigger this issue?

An attacker triggers this by sending specially crafted data over the network to a vulnerable application. The flaw is not triggered by standard, well-formed data interactions, but rather by malformed packets designed to exploit the lack of bounds checking. If the application handles this unexpected input incorrectly, it can lead to immediate termination or destabilization of the application's memory heap.

Why should I care about CVE-2026-64771?

While the vulnerability is reachable over the network, Halo Surface Signal notes it is unlikely to affect common infrastructure services because it impacts end-user operating systems. These devices are typically not used as public-facing gateways. However, users should remain aware if their devices are connected to networks where they might receive unsolicited or malicious data streams.

Do I need to update my devices to fix this?

Yes. The most effective way to address this is to ensure your devices are updated to the corrected software versions, such as 26.6 for iOS, iPadOS, macOS Tahoe, tvOS, and visionOS, or macOS Sequoia 15.7.8. Start by identifying all devices in your environment running older versions, verify their current status, and prioritize applying these updates to restore proper memory bounds checking.

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.