CVE-2026-84552: Apple iPadOS Use-After-Free Vulnerability

CVE-2026-84552 Overview

CVE-2026-84552 is a memory handling flaw affecting multiple Apple operating systems. A local application can trigger unexpected system termination, resulting in denial of service on the affected device. The vulnerability is associated with [CWE-125] Out-of-Bounds Read, indicating improper bounds checking during memory operations. Apple addressed the issue through improved memory handling across iOS, iPadOS, and macOS product lines. Exploitation requires local access with low privileges but no user interaction. The vulnerability impacts availability only; confidentiality and integrity of data are not affected.

Critical Impact
A malicious app running locally can cause unexpected system termination on affected Apple devices, disrupting device availability.

Affected Products

Apple iOS (versions prior to iOS 26.7 and iOS 27)
Apple iPadOS (versions prior to iPadOS 26.7 and iPadOS 27)
Apple macOS (versions prior to macOS Sequoia 15.8, macOS Tahoe 26.7, and macOS Golden Gate 27)

Discovery Timeline

2026-09-14 - CVE-2026-84552 published to the National Vulnerability Database
2026-09-17 - Last updated in NVD database

Technical Details for CVE-2026-84552

Vulnerability Analysis

CVE-2026-84552 stems from improper memory handling within an unspecified component shared across Apple's iOS, iPadOS, and macOS platforms. The flaw allows a locally installed application to trigger conditions leading to unexpected system termination. Apple's advisory attributes the fix to "improved memory handling," a description commonly associated with out-of-bounds memory access issues, consistent with the assigned [CWE-125] classification. The vulnerability affects availability but does not expose sensitive data or allow modification of system state. Exploitation does not require user interaction, making it usable by any application already running on the device.

Root Cause

The root cause is an out-of-bounds read condition in a component that processes memory in a shared code path across iOS, iPadOS, and macOS. Apple has not publicly disclosed the specific subsystem or function involved. The absence of proper bounds validation permits an app to read memory outside allocated regions, which the kernel or a privileged process interprets as a fatal error, leading to termination.

Attack Vector

An attacker must first deliver a malicious application to the target device, typically through sideloading, developer provisioning, or a repackaged app. Once running with normal user privileges, the app issues crafted requests that trigger the flawed memory read path. The resulting fault causes an unexpected system termination, forcing the device to reboot or crash the responsible subsystem. Because no user interaction is required after installation, the app can trigger the condition silently in the background.

No verified public proof-of-concept code is available for this vulnerability. Refer to the Apple security advisories referenced below for additional technical context.

Detection Methods for CVE-2026-84552

Indicators of Compromise

Unexplained system reboots or kernel panics on iOS, iPadOS, or macOS endpoints running unpatched versions.
Crash reports referencing memory access violations from third-party applications in ~/Library/Logs/DiagnosticReports/ on macOS.
Presence of recently installed or sideloaded applications immediately preceding system termination events.

Detection Strategies

Correlate application launch events with subsequent kernel panic or unexpected shutdown logs to identify triggering processes.
Inventory endpoints running iOS, iPadOS, or macOS versions below the patched builds and prioritize them for remediation.
Review MDM telemetry for repeated crash-loop patterns on managed Apple devices.

Monitoring Recommendations

Enable centralized collection of macOS unified logs and iOS crash diagnostics through your Mobile Device Management platform.
Alert on repeated SIGKILL or panic events tied to a common application bundle identifier.
Track OS version compliance across the Apple device fleet and flag hosts that remain on vulnerable builds.

How to Mitigate CVE-2026-84552

Immediate Actions Required

Update all Apple devices to iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Sequoia 15.8, macOS Tahoe 26.7, or macOS Golden Gate 27.
Restrict installation of untrusted or sideloaded applications through MDM configuration profiles.
Audit installed applications on managed devices and remove any unsanctioned software.

Patch Information

Apple has released fixes in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. Refer to the following advisories for platform-specific details: Apple Support Article #149034, Apple Support Article #149035, Apple Support Article #149041, Apple Support Article #149042, and Apple Support Article #149043.

Workarounds

Limit app installations to the official App Store and vetted enterprise distribution channels until patches are deployed.
Use MDM policies to block unknown developer certificates and enforce app allowlisting on managed endpoints.
Monitor and remove any application observed causing repeated device terminations while patch rollout is in progress.

bash

# Verify current macOS version and update via CLI
sw_vers -productVersion
sudo softwareupdate --install --all --restart