CVE-2026-28875: Apple iPadOS Buffer Overflow Vulnerability

CVE-2026-28875 Overview

CVE-2026-28875 is a buffer overflow vulnerability affecting Apple iOS and iPadOS operating systems. The vulnerability stems from improper bounds checking, which allows a remote attacker to trigger a denial-of-service condition on affected devices. Apple addressed this security issue with improved bounds checking in iOS 26.4 and iPadOS 26.4.

Critical Impact

Remote attackers can exploit this buffer overflow vulnerability to cause denial-of-service on unpatched Apple mobile devices without requiring authentication or user interaction.

Affected Products

• Apple iOS (versions prior to 26.4)
• Apple iPadOS (versions prior to 26.4)
• Apple iPhone and iPad devices running vulnerable operating system versions

Discovery Timeline

• 2026-03-25 - CVE-2026-28875 published to NVD
• 2026-03-25 - Last updated in NVD database

Technical Details for CVE-2026-28875

Vulnerability Analysis

This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), a classic buffer overflow weakness. The flaw exists in how the operating system handles certain data inputs, where insufficient bounds validation allows an attacker to write beyond the allocated buffer space. When exploited, this memory corruption leads to system instability and denial-of-service conditions.

The vulnerability can be triggered remotely over the network without requiring any privileges or user interaction, making it particularly concerning for devices exposed to untrusted network traffic. While the vulnerability does not directly compromise confidentiality or integrity, its ability to disrupt device availability represents a significant risk for users who depend on their mobile devices for critical communications.

Root Cause

The root cause of CVE-2026-28875 is a classic buffer overflow condition (CWE-120) where data is copied to a buffer without properly validating the size of the input against the buffer's capacity. This occurs when the system processes network-originated data and fails to enforce proper boundary limits before memory copy operations.

In buffer overflow scenarios like this, oversized input data overwrites adjacent memory locations, corrupting critical data structures or control flow information. Apple's fix addressed this by implementing improved bounds checking to validate input sizes before buffer operations are performed.

Attack Vector

The attack vector for this vulnerability is network-based, meaning exploitation can occur remotely without physical access to the target device. Key characteristics of the attack include:

• Network-accessible: Attackers can reach vulnerable devices over network connections
• No authentication required: The vulnerability can be triggered without valid credentials
• No user interaction needed: Exploitation does not require the device user to perform any action
• Availability impact: Successful exploitation results in denial-of-service, potentially crashing the affected application or causing system instability

The vulnerability mechanism involves sending specially crafted network data that exceeds expected buffer sizes. When the vulnerable component processes this malformed input without adequate size validation, the resulting buffer overflow corrupts memory and disrupts normal operation. For technical implementation details, refer to the Apple Support Article.

Detection Methods for CVE-2026-28875

Indicators of Compromise

• Unexpected application crashes or system reboots on iOS/iPadOS devices
• Abnormal network traffic patterns targeting Apple device services
• Memory corruption errors or kernel panics in device diagnostic logs
• Repeated connection attempts from suspicious external IP addresses

Detection Strategies

• Monitor network traffic for anomalous data patterns targeting iOS/iPadOS services
• Implement intrusion detection rules to identify potential buffer overflow exploitation attempts
• Deploy endpoint detection solutions capable of identifying memory corruption attacks
• Review device crash logs for patterns consistent with buffer overflow conditions

Monitoring Recommendations

• Enable and centrally collect device diagnostic and crash logs from iOS/iPadOS fleet
• Configure network monitoring to alert on unusual traffic volumes to mobile devices
• Establish baseline behavior for device stability and investigate deviations
• Monitor Apple security bulletins and threat intelligence feeds for exploitation reports

How to Mitigate CVE-2026-28875

Immediate Actions Required

• Update all iOS devices to version 26.4 or later immediately
• Update all iPadOS devices to version 26.4 or later immediately
• Prioritize patching for devices exposed to untrusted networks
• Implement network segmentation to limit exposure of unpatched devices

Patch Information

Apple has released security updates that address this vulnerability through improved bounds checking. The fix is included in iOS 26.4 and iPadOS 26.4. Organizations should deploy these updates through their mobile device management (MDM) solutions as soon as possible.

For complete patch details and installation instructions, refer to the official Apple Support Article.

Workarounds

• Restrict network access to vulnerable devices until patches can be applied
• Enable network filtering to block potentially malicious traffic patterns
• Use VPN connections when devices must operate on untrusted networks
• Consider temporarily isolating critical devices that cannot be immediately patched

# MDM Configuration - Enforce minimum OS version policy
# Configure your MDM solution to enforce iOS/iPadOS 26.4 as minimum version
# Example: Set compliance policy to require OS version >= 26.4
# Quarantine non-compliant devices until updated