CVE-2025-43236: macOS Use-After-Free Vulnerability

CVE-2025-43236 Overview

CVE-2025-43236 is a type confusion vulnerability affecting multiple versions of Apple macOS. The flaw exists due to improper memory handling that allows an attacker to potentially cause unexpected application termination. This vulnerability was addressed by Apple with improved memory handling in security updates released for macOS Sequoia, Sonoma, and Ventura.

Critical Impact

An attacker may be able to cause unexpected app termination through type confusion, leading to denial of service conditions on affected macOS systems.

Affected Products

• macOS Sequoia (versions prior to 15.6)
• macOS Sonoma (versions prior to 14.7.7)
• macOS Ventura (versions prior to 13.7.7)

Discovery Timeline

• 2026-04-02 - CVE-2025-43236 published to NVD
• 2026-04-02 - Last updated in NVD database

Technical Details for CVE-2025-43236

Vulnerability Analysis

This vulnerability is classified as CWE-843 (Access of Resource Using Incompatible Type, also known as Type Confusion). Type confusion vulnerabilities occur when a program allocates or initializes a resource using one type but later accesses that resource using an incompatible type. In this case, the macOS operating system failed to properly validate memory types during certain operations, allowing an attacker to trigger unexpected behavior.

The attack requires local access to the system and user interaction, limiting the scope of potential exploitation. When successfully exploited, the vulnerability impacts system availability by causing application crashes, though it does not directly compromise data confidentiality or integrity.

Root Cause

The root cause of CVE-2025-43236 lies in improper memory handling within macOS components. The system failed to adequately validate the type of objects being accessed, leading to type confusion conditions. When code attempts to process memory using an incompatible type interpretation, it can result in memory corruption or unexpected program states that cause application termination.

Apple addressed this vulnerability by implementing improved memory handling mechanisms that properly validate object types before access operations are performed.

Attack Vector

The vulnerability requires local access to exploit, meaning an attacker must have some level of access to the target macOS system. Additionally, user interaction is required, which typically means the victim must perform some action such as opening a malicious file or interacting with a crafted application.

The exploitation scenario involves crafting input that triggers the type confusion condition in the vulnerable component. When the affected application processes this malicious input with incorrect type assumptions, it leads to memory corruption and subsequent application crash.

Detection Methods for CVE-2025-43236

Indicators of Compromise

• Unexpected application crashes or terminations on macOS systems
• System logs showing memory-related errors or exceptions in affected applications
• Crash reports indicating type-related memory access violations

Detection Strategies

• Monitor system crash reports for patterns indicating type confusion exploitation attempts
• Implement endpoint detection solutions to identify anomalous application behavior
• Review system logs for unexpected application termination events
• Deploy SentinelOne agents to detect and respond to exploitation attempts in real-time

Monitoring Recommendations

• Enable crash reporting and regularly review crash logs for suspicious patterns
• Monitor for unusual process terminations across enterprise macOS fleet
• Implement centralized logging to correlate crash events across multiple endpoints
• Utilize SentinelOne's behavioral AI to detect potential exploitation activity

How to Mitigate CVE-2025-43236

Immediate Actions Required

• Update macOS Sequoia to version 15.6 or later
• Update macOS Sonoma to version 14.7.7 or later
• Update macOS Ventura to version 13.7.7 or later
• Enable automatic software updates to ensure timely patch deployment
• Restrict local access to sensitive systems until patches are applied

Patch Information

Apple has released security updates to address this vulnerability. The patches include improved memory handling to prevent type confusion conditions. Users should apply the following updates:

• macOS Sequoia 15.6 - See Apple Support Advisory 124149
• macOS Sonoma 14.7.7 - See Apple Support Advisory 124150
• macOS Ventura 13.7.7 - See Apple Support Advisory 124151

Workarounds

• Limit local access to affected systems to trusted users only
• Exercise caution when opening files from untrusted sources
• Implement application sandboxing where possible to limit crash impact
• Monitor for unusual application behavior and investigate unexpected terminations

# Check current macOS version
sw_vers

# Enable automatic updates via Terminal
sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate AutomaticCheckEnabled -bool true
sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate AutomaticDownload -bool true
sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate AutomaticallyInstallMacOSUpdates -bool true