External risk intelligence

Apple Integer Overflow Allows Remote Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-64774

The vulnerability affects client-side operating systems (iOS, iPadOS, macOS, tvOS, visionOS). These products are typically used as end-user devices rather than public-facing servers or internet-exposed services, making public network reachability in common deployments unlikely.

Integer Overflow

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

An integer overflow vulnerability has been identified in Apple operating systems that could allow a remote attacker to cause unexpected application termination or data corruption. The issue has been addressed with improved input validation in the latest updates.

Allows attackers to crash apps or corrupt data.
Crucial for confirming relevance and exposure.
Assess impact on Apple device fleet.

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 behavior within the application, potentially resulting in a crash or memory corruption.

No special access needed.
Triggered by malformed network data.
Risk of app termination or corruption.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, a remote attacker could potentially cause unexpected application termination or heap corruption. This could affect system stability and the integrity of running applications.

System stability and application integrity.
Remote exploitation via network.
Unexpected application termination or corruption.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts client-side operating systems, suggesting that end-user device management and platform teams are primarily responsible for remediation. The first practical step is to identify all affected devices, confirm their reachability and business criticality, and then plan an update strategy based on risk assessment and the availability of vendor patches.

Identify device owners and scope.
Verify device reachability and impact.
Plan and deploy vendor updates.

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-2026-64774?

This vulnerability impacts core Apple operating systems, including iOS, iPadOS, macOS (Sequoia, Sonoma, and Tahoe), tvOS, and visionOS. These platforms serve as the foundation for mobile devices, laptops, desktops, and integrated hardware, managing user applications and system resources.

What is an integer overflow in the context of this CVE?

An integer overflow (CWE-190) occurs when an application attempts to perform a math operation on a number that exceeds the maximum size the system can handle. In this CVE, improper input validation allows an attacker to manipulate this calculation, which can lead the system to mishandle memory, causing application crashes or heap corruption.

How is CVE-2026-64774 triggered?

The issue is triggered when a vulnerable application processes specially crafted data sent over a network. It does not require user interaction or elevated privileges to initiate. Simply browsing to or interacting with a network service that accepts malformed data is enough; standard, well-formed network traffic does not trigger the flaw.

Is my device at risk based on Halo Surface Signal?

Halo Surface Signal indicates that the risk of public network reachability is very unlikely. Because CVE-2026-64774 impacts client-side operating systems—typically personal devices rather than public-facing servers—these systems are not usually directly exposed to the open internet in common network configurations.

How should I respond to this vulnerability?

Your first step is to inventory your Apple device fleet to identify which systems are running older, unpatched versions of the affected operating systems. Once identified, prioritize devices based on their business use and reachability, and plan to deploy the vendor-provided security updates that resolve the input validation errors.

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.