CVE-2026-28852: Apple iPadOS Stack Overflow DoS Vulnerability

CVE-2026-28852 Overview

CVE-2026-28852 is a stack overflow vulnerability affecting multiple Apple operating systems including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. The vulnerability stems from improper input validation, which Apple addressed in recent security updates. When exploited, a malicious application may be able to cause a denial-of-service condition on affected devices.

Critical Impact

A malicious application can exploit this stack overflow vulnerability to cause denial-of-service conditions across Apple's entire ecosystem of devices, potentially rendering iPhones, iPads, Macs, Apple TVs, Vision Pro headsets, and Apple Watches temporarily unusable.

Affected Products

• Apple iOS (prior to versions 18.7.7 and 26.4)
• Apple iPadOS (prior to versions 18.7.7 and 26.4)
• Apple macOS (prior to Sequoia 15.7.5 and Tahoe 26.4)
• Apple tvOS (prior to version 26.4)
• Apple visionOS (prior to version 26.4)
• Apple watchOS (prior to version 26.4)

Discovery Timeline

• March 25, 2026 - CVE-2026-28852 published to NVD
• March 25, 2026 - Last updated in NVD database

Technical Details for CVE-2026-28852

Vulnerability Analysis

This vulnerability is classified as CWE-20 (Improper Input Validation), resulting in a stack overflow condition. The flaw exists within the input validation routines of the affected Apple operating systems. When specially crafted input is processed, the lack of proper boundary checking allows data to overflow the stack buffer, leading to application crashes and denial-of-service conditions.

The attack requires local access and user interaction, meaning an attacker would need to convince a user to install and run a malicious application. While the vulnerability does not allow for data exfiltration or system compromise, it can significantly impact device availability by causing repeated crashes or system instability.

Root Cause

The root cause of CVE-2026-28852 lies in insufficient input validation within system components across Apple's operating systems. When processing certain inputs, the affected code fails to properly validate the size or structure of incoming data before copying it to stack-allocated buffers. This oversight allows an attacker to supply input that exceeds the expected buffer size, causing the stack to overflow and corrupting adjacent memory regions, ultimately leading to application or system crashes.

Attack Vector

The attack requires local access to the target device, typically achieved through a malicious application installed on the victim's device. The attacker must craft an application that provides malformed input to the vulnerable system component. When the user interacts with the malicious app, the crafted input triggers the stack overflow condition.

The vulnerability can be exploited without requiring elevated privileges, though user interaction is necessary to trigger the vulnerable code path. The impact is limited to availability (denial-of-service), with no demonstrated ability to compromise confidentiality or integrity of system data.

Since no verified code examples are available for this vulnerability, the exploitation mechanism involves providing input data that exceeds expected boundaries during processing. Interested readers should consult the Apple Security Advisory #126792 and related advisories for additional technical details.

Detection Methods for CVE-2026-28852

Indicators of Compromise

• Repeated application crashes or unexpected system reboots without clear cause
• Presence of recently installed untrusted applications that may be triggering the vulnerability
• System log entries indicating stack overflow errors or memory corruption in system processes
• Unusual resource consumption patterns preceding system instability

Detection Strategies

• Monitor system crash logs for patterns indicating stack overflow or memory corruption issues
• Implement application whitelisting to prevent unauthorized apps from executing on managed devices
• Deploy mobile device management (MDM) solutions to detect and alert on abnormal application behavior
• Review installed applications for unknown or suspicious entries that could be exploiting this vulnerability

Monitoring Recommendations

• Enable comprehensive system logging on all Apple devices to capture crash reports and error conditions
• Configure alerts for repeated system crashes or application failures on managed devices
• Monitor MDM solutions for devices running outdated OS versions susceptible to this vulnerability
• Implement automated compliance checks to verify devices are running patched OS versions

How to Mitigate CVE-2026-28852

Immediate Actions Required

• Update all affected Apple devices to the latest patched versions immediately
• Remove any suspicious or untrusted applications from devices
• Enable automatic updates on all Apple devices to receive future security patches promptly
• Restrict app installations to trusted sources (App Store) using MDM policies where applicable

Patch Information

Apple has released security updates to address this vulnerability across all affected platforms. Users and administrators should update to the following versions or later:

• iOS/iPadOS: Update to version 18.7.7 or 26.4
• macOS: Update to Sequoia 15.7.5 or Tahoe 26.4
• tvOS: Update to version 26.4
• visionOS: Update to version 26.4
• watchOS: Update to version 26.4

Detailed patch information is available in the official Apple Security Advisories:

• Apple Security Advisory #126792
• Apple Security Advisory #126793
• Apple Security Advisory #126794
• Apple Security Advisory #126795
• Apple Security Advisory #126797
• Apple Security Advisory #126798
• Apple Security Advisory #126799

Workarounds

• Restrict application installations to App Store-vetted applications only until patches can be applied
• Enable Lockdown Mode on iOS/iPadOS devices for high-risk users, which may reduce the attack surface
• Use MDM profiles to prevent installation of unmanaged applications on enterprise devices
• Isolate unpatched devices from critical network resources until updates can be deployed

# Check current iOS/iPadOS version via MDM or device settings
# Navigate to: Settings > General > About > Software Version
# Ensure version is 18.7.7 or 26.4 or later

# For macOS, check version via Terminal:
sw_vers -productVersion
# Ensure output shows 15.7.5 (Sequoia) or 26.4 (Tahoe) or later