CVE-2026-64770: Apple iPadOS Buffer Overflow Vulnerability

CVE-2026-64770 Overview

CVE-2026-64770 is an out-of-bounds write vulnerability [CWE-787] affecting multiple Apple operating systems. A remote attacker can trigger unexpected application termination or heap corruption without authentication or user interaction. Apple addressed the flaw with improved bounds checking across iOS, iPadOS, macOS, tvOS, and visionOS. The vulnerability carries a CVSS score of 9.8 and impacts confidentiality, integrity, and availability at the highest level. The EPSS score is 0.432% with a percentile of 35.557 as of 2026-07-30.

Critical Impact
A remote, unauthenticated attacker can cause heap corruption on Apple devices, creating conditions that may lead to arbitrary code execution.

Affected Products

Apple iOS 26.6 and iPadOS 26.6 (prior versions)
Apple macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6 (prior versions)
Apple tvOS 26.6 and visionOS 26.6 (prior versions)

Discovery Timeline

2026-07-27 - CVE-2026-64770 published to the National Vulnerability Database (NVD)
2026-07-28 - Last updated in NVD database

Technical Details for CVE-2026-64770

Vulnerability Analysis

The vulnerability is an out-of-bounds write [CWE-787] in an Apple operating system component present across iOS, iPadOS, macOS, tvOS, and visionOS. The affected code writes data past the boundaries of an allocated buffer when processing attacker-controlled input. This condition corrupts adjacent heap memory structures used by the target process.

Heap corruption in this context enables two documented outcomes. First, the affected application may terminate unexpectedly, producing a denial-of-service condition. Second, controlled corruption of heap metadata or adjacent object pointers may allow an attacker to influence execution flow. Apple has not disclosed the specific component or parsing routine involved, referring integrators to advisories 128066, 128067, 128069, 128070, 128071, and 128072.

Root Cause

The root cause is insufficient bounds validation before a memory write operation. According to Apple, the fix introduces improved bounds checking. Prior to the patch, the vulnerable code path did not verify that the destination offset and write length remained within the allocated buffer, permitting writes into adjacent heap regions.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. A remote attacker delivers crafted input to the vulnerable component, triggering the out-of-bounds write. The specific delivery mechanism depends on the affected component, but network reachability is sufficient to initiate exploitation against unpatched devices.

No verified proof-of-concept exploit code is available for CVE-2026-64770. See the Apple Support Advisory #128066 for vendor technical details.

Detection Methods for CVE-2026-64770

Indicators of Compromise

Unexpected termination or crash reports from system services or user applications on Apple devices at pre-patch OS versions.
Repeated crash signatures referencing heap corruption, EXC_BAD_ACCESS, or malloc guard violations in system diagnostic logs.
Anomalous inbound network traffic to Apple devices from untrusted sources preceding process crashes.

Detection Strategies

Inventory endpoint operating system versions and flag devices running iOS/iPadOS below 26.6, macOS Sequoia below 15.7.8, macOS Sonoma below 14.8.8, macOS Tahoe below 26.6, tvOS below 26.6, or visionOS below 26.6.
Ingest macOS unified logs and iOS crash reports into a centralized data lake and alert on repeated crashes tied to the same process and network peer.
Correlate network telemetry with endpoint crash events to identify remote triggering patterns consistent with exploitation attempts.

Monitoring Recommendations

Monitor Apple software update compliance across managed fleets using MDM reporting.
Track process crash rates on Apple endpoints and alert on statistically significant increases.
Review Apple security advisories 128066 through 128072 for component identification when Apple publishes additional detail.

How to Mitigate CVE-2026-64770

Immediate Actions Required

Deploy Apple security updates to bring devices to iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, and visionOS 26.6.
Prioritize internet-exposed and high-value devices for immediate patching given the network attack vector and lack of authentication requirement.
Enforce update compliance through Mobile Device Management (MDM) policies and block non-compliant devices from sensitive network segments.

Patch Information

Apple has released fixed versions across all affected platforms. Refer to the following advisories for build numbers and download links: Apple Support Advisory #128066, Apple Support Advisory #128067, Apple Support Advisory #128069, Apple Support Advisory #128070, Apple Support Advisory #128071, and Apple Support Advisory #128072.

Workarounds

No vendor-supplied workaround exists. Restrict network exposure of affected devices until patches are applied.
Segment Apple endpoints behind firewalls and limit inbound connections from untrusted networks.
Disable non-essential services on unpatched devices to reduce the reachable attack surface.

bash

# Verify macOS version on managed endpoints
sw_vers -productVersion

# Trigger a software update check on macOS
sudo softwareupdate --list
sudo softwareupdate --install --all --restart