CVE-2025-43338 in iOS
Summary
by MITRE • 11/04/2025
An out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in macOS Tahoe 26, macOS Sonoma 14.8.2. Processing a maliciously crafted media file may lead to unexpected app termination or corrupt process memory.
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Analysis
by VulDB Data Team • 02/16/2026
The vulnerability identified as CVE-2025-43338 represents a critical out-of-bounds memory access flaw that affects Apple's macOS operating system. This issue manifests when the system processes media files that have been specifically crafted to exploit the bounds checking mechanism within the media handling components. The vulnerability is categorized under CWE-129, which deals with insufficient bounds checking, and falls into the broader category of memory safety issues that can lead to arbitrary code execution or system instability. The flaw exists in the media processing libraries that handle various audio and video file formats, making it particularly dangerous given the ubiquity of multimedia content in modern computing environments.
The technical implementation of this vulnerability stems from inadequate validation of buffer boundaries during media file parsing operations. When a maliciously crafted media file is processed, the system's media decoder fails to properly validate array indices or buffer limits, allowing an attacker to manipulate memory access patterns. This improper bounds checking can occur in multiple media processing contexts including audio decoding, video frame parsing, and metadata extraction routines. The vulnerability is particularly concerning because it can be triggered through common user interactions such as opening media files in applications like QuickTime, Photos, or other media handling software that relies on the underlying macOS media processing frameworks.
The operational impact of this vulnerability extends beyond simple application crashes to potentially enable more sophisticated attacks. While the immediate effect may appear as unexpected application termination or corrupted process memory, the underlying memory corruption could provide an attacker with opportunities for privilege escalation or code execution within the application's memory space. The vulnerability affects multiple versions of macOS including the Tahoe 26 and Sonoma 14.8.2 releases, indicating that it represents a widespread issue across the macOS ecosystem. This type of vulnerability aligns with ATT&CK technique T1059.007, which covers command and scripting interpreter usage, as attackers may leverage memory corruption to execute malicious code within compromised processes.
Security professionals should prioritize patching affected macOS versions as soon as the updates become available, since the vulnerability can be exploited through user interaction with malicious media files. The fix implemented by Apple involves enhanced bounds checking mechanisms that properly validate all memory access operations during media file processing. Organizations should also implement additional security measures including media file scanning, application sandboxing, and user education about avoiding untrusted media content. The vulnerability demonstrates the importance of robust input validation in multimedia processing systems and highlights the need for continuous security testing of media handling components. Network security teams should monitor for potential exploitation attempts and consider implementing network-based detection rules that identify suspicious media file characteristics that could indicate malicious intent.