CVE-2026-43733 in iOS
Summary
by MITRE • 07/28/2026
The issue was addressed with improved memory handling. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6. Processing a maliciously crafted image may corrupt process memory.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a critical memory corruption flaw that emerged in Apple's operating systems affecting iOS 26.6 and iPadOS 26.6 as well as macOS Sequoia 15.7.8 and macOS Tahoe 26.6. The issue stems from inadequate memory handling mechanisms when processing image files, creating a potential pathway for malicious actors to exploit system stability and security boundaries. The vulnerability falls under the broader category of memory safety issues that have been extensively documented in cybersecurity literature and aligns with common weakness enumerations such as CWE-125 out-of-bounds read conditions and CWE-787 out-of-bounds write conditions.
The technical implementation flaw manifests when the system processes image files containing malformed or specially crafted data structures. These malicious images can trigger memory corruption that leads to unpredictable behavior including application crashes, arbitrary code execution, or privilege escalation opportunities. The root cause lies in insufficient bounds checking and validation routines during image parsing operations, particularly in how the system allocates and manages memory buffers for image processing tasks. This type of vulnerability represents a classic example of heap-based memory corruption that can be exploited through various attack vectors including social engineering campaigns targeting end users or automated scanning systems.
The operational impact of this vulnerability extends beyond simple denial-of-service conditions to potentially enable sophisticated attack scenarios where adversaries could leverage the memory corruption to execute malicious code with elevated privileges. Attackers might craft specific image files designed to exploit the memory handling deficiencies, potentially leading to complete system compromise or data exfiltration capabilities. The vulnerability affects Apple's core operating systems and represents a significant concern for enterprise environments where users may encounter such malicious images through email attachments, web browsing, or file downloads from untrusted sources. Security professionals should note that this issue demonstrates the ongoing challenges in memory safety within modern operating system implementations and aligns with attack patterns documented in the mitre ATT&CK framework under techniques related to privilege escalation and code execution.
The remediation implemented by Apple focuses on enhanced memory handling procedures and improved validation mechanisms for image processing components. This fix addresses the underlying memory corruption vulnerabilities through better bounds checking, more robust buffer management, and strengthened input sanitization routines during image parsing operations. Organizations should prioritize deployment of these updates across all affected systems to mitigate potential exploitation risks and maintain operational security posture. The vulnerability serves as a reminder of the critical importance of regular security updates and proper memory management practices in preventing sophisticated cyber attacks that target system stability and integrity.