CVE-2026-43673: Apple iPadOS Buffer Overflow Vulnerability

CVE-2026-43673 Overview

CVE-2026-43673 is a memory corruption vulnerability affecting a broad range of Apple operating systems. Processing a maliciously crafted audio file may corrupt process memory, potentially enabling local code execution. The flaw is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). Apple addressed the issue with improved memory handling in iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, and watchOS 26.6. Exploitation requires user interaction to open or process the crafted audio content.

Critical Impact
A local attacker who convinces a user to process a malicious audio file can corrupt process memory, leading to loss of confidentiality, integrity, and availability on affected Apple devices.

Affected Products

Apple iOS and iPadOS (fixed in 26.6)
Apple macOS Sequoia (fixed in 15.7.8), macOS Sonoma (fixed in 14.8.8), and macOS Tahoe (fixed in 26.6)
Apple tvOS, visionOS, and watchOS (all fixed in 26.6)

Discovery Timeline

2026-07-27 - CVE-2026-43673 published to NVD
2026-07-28 - Last updated in NVD database

Technical Details for CVE-2026-43673

Vulnerability Analysis

The vulnerability resides in the audio processing components shared across Apple's operating systems. When the affected audio parser handles a maliciously crafted audio file, it fails to properly restrict memory operations within intended buffer bounds. This results in memory corruption within the process handling the file.

Apple's advisory states the issue was addressed with improved memory handling, which is consistent with a boundary-checking or buffer management defect in the audio codec or media framework. Successful memory corruption in a media-parsing context has historically been leveraged for arbitrary code execution within the parsing process, subject to platform sandboxing.

Root Cause

The root cause is improper restriction of operations within the bounds of a memory buffer [CWE-119] in the audio file processing routines. Malformed structural fields in the audio file drive the parser to read or write outside allocated regions, corrupting adjacent process memory.

Attack Vector

Exploitation is local and requires user interaction. An attacker must deliver a crafted audio file to the victim and convince them to open or otherwise process it through an affected application or system service. Delivery vectors include email attachments, messaging apps, web downloads, and shared media libraries. No privileges are required for the attacker on the target device prior to exploitation.

No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-43673

Indicators of Compromise

Unexpected crashes or ReportCrash entries referencing audio frameworks such as CoreAudio, AudioToolbox, or AudioCodecs.
Delivery of audio files (for example .mp3, .m4a, .caf, .aac, .wav) from untrusted senders followed by application instability.
Anomalous child process creation or code signing violations originating from processes that recently handled audio content.

Detection Strategies

Monitor endpoint telemetry for repeated crashes of media-handling processes on Apple devices running vulnerable OS versions.
Correlate audio file downloads or message attachments with subsequent process termination events on the same host.
Inspect crash logs for memory access violations (EXC_BAD_ACCESS, SIGSEGV) tied to audio parsing stack frames.

Monitoring Recommendations

Track OS build versions across the Apple fleet and flag hosts running versions prior to the fixed releases.
Alert on execution of unsigned or newly-observed binaries spawned by media-processing contexts.
Collect and centralize macOS Unified Logs and iOS analytics data for retrospective analysis of media parser crashes.

How to Mitigate CVE-2026-43673

Immediate Actions Required

Update all affected 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, visionOS 26.6, or watchOS 26.6.
Instruct users to avoid opening audio files from untrusted or unsolicited sources until patches are applied.
Prioritize patching for high-value users and devices that regularly process media from external parties.

Patch Information

Apple has released fixes across its platform family. Refer to the vendor advisories for build-specific details: Apple Security Update 128066, Apple Security Update 128067, Apple Security Update 128068, Apple Security Update 128069, Apple Security Update 128070, Apple Security Update 128071, and Apple Security Update 128072.

Workarounds

Restrict receipt and automatic preview of audio attachments in email and messaging clients until updates are deployed.
Enforce mobile device management (MDM) policies that require minimum OS versions matching the fixed releases.
Educate users to verify the origin of audio files before opening them, particularly files delivered outside of trusted workflows.

bash

# Verify current macOS version against fixed releases
sw_vers -productVersion

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