CVE-2026-43744 Overview
CVE-2026-43744 is an out-of-bounds write vulnerability [CWE-787] affecting audio stream processing across Apple's operating systems. Processing a maliciously crafted media file may terminate the process, resulting in a denial-of-service condition. Apple addressed the issue with improved bounds checking 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.
The vulnerability requires local access and user interaction to trigger. No public exploit is available, and CISA has not listed it in the Known Exploited Vulnerabilities catalog.
Critical Impact
Attackers can crash the media processing component by delivering a crafted audio stream, causing an availability impact on the target device.
Affected Products
- Apple iOS and iPadOS prior to 26.6
- Apple macOS Sequoia prior to 15.7.8, Sonoma prior to 14.8.8, and Tahoe prior to 26.6
- Apple tvOS, visionOS, and watchOS prior to 26.6
Discovery Timeline
- 2026-07-27 - CVE-2026-43744 published to NVD
- 2026-07-29 - Last updated in NVD database
Technical Details for CVE-2026-43744
Vulnerability Analysis
The vulnerability resides in the audio stream processing logic used across Apple's media framework. When the parser handles a specially crafted media file, it writes data past the boundary of an allocated buffer. This out-of-bounds write corrupts adjacent memory and causes the processing task to terminate abnormally.
The issue is categorized under [CWE-787], Out-of-bounds Write. Apple's advisories describe the fix as improved bounds checking, indicating that the vulnerable routine did not sufficiently validate size or offset values derived from attacker-controlled media metadata.
Exploitation requires the target to open or preview a malicious media file locally. Confidentiality and integrity are not impacted, but availability of the media processing component is affected.
Root Cause
The root cause is missing or insufficient boundary validation in the audio stream parser. Fields inside the malformed media container drive write operations into a fixed-size buffer without proper length checks, permitting writes beyond the buffer end.
Attack Vector
An attacker delivers a crafted media file to the victim through email, messaging, web download, or shared storage. When the user opens the file with an application that invokes the vulnerable audio processing path, the process terminates. The attack requires local access and user interaction, and does not require elevated privileges.
No verified proof-of-concept code has been published. See the Apple security advisories for authoritative technical details.
Detection Methods for CVE-2026-43744
Indicators of Compromise
- Repeated crashes of media-related processes such as coreaudiod, AudioComponentRegistrar, or applications invoking AVFoundation when handling untrusted media files.
- Presence of crash logs referencing out-of-bounds write faults inside audio decoding frames.
- Unusual media files delivered through email attachments, messaging apps, or web downloads that trigger process termination on open.
Detection Strategies
- Monitor macOS unified logs and iOS crash reports for EXC_BAD_ACCESS events originating in audio parsing libraries.
- Correlate media file downloads or transfers with subsequent process crashes on the same endpoint within a short time window.
- Inspect endpoint telemetry for unsigned or unusually structured media files being opened by media players and browsers.
Monitoring Recommendations
- Ingest macOS and iOS diagnostic reports into a centralized logging pipeline to identify crash clusters tied to audio components.
- Track OS version inventory to identify endpoints still running vulnerable Apple builds.
- Alert on delivery of media file types from untrusted senders or unmanaged sources to high-value users.
How to Mitigate CVE-2026-43744
Immediate Actions Required
- Update Apple 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.
- Prioritize patching for devices that regularly process media from external senders or web sources.
- Advise users to avoid opening media files from unknown or untrusted origins until patches are deployed.
Patch Information
Apple published fixes across seven advisories covering each affected operating system. Refer to the Apple Support Document #128066, Apple Support Document #128067, Apple Support Document #128068, Apple Support Document #128069, Apple Support Document #128070, Apple Support Document #128071, and Apple Support Document #128072 for version-specific patch information.
Workarounds
- Restrict opening media files from untrusted sources on unpatched devices.
- Use email and web gateways to filter or sandbox unsolicited audio and media attachments.
- Enforce mobile device management policies that require the latest Apple OS builds before granting access to corporate resources.
# Verify installed macOS version and confirm patch level
sw_vers -productVersion
# Check available Apple software updates
sudo softwareupdate --list
# Install all available updates and restart if required
sudo softwareupdate --install --all --restart
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
