CVE-2026-43779 in macOS
Summary
by MITRE • 07/28/2026
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to intercept network connections intended for another process.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a significant security flaw in apple's operating system that allows malicious applications to potentially intercept network traffic intended for other processes. The issue stems from inadequate process isolation mechanisms within the network stack, creating an avenue for unauthorized data access and potential man-in-the-middle attacks. The problem manifests when applications fail to properly enforce network connection boundaries, enabling one app to monitor or manipulate communications that should remain isolated to another process.
The technical root cause involves insufficient validation of network connection contexts and improper enforcement of process-specific network permissions. When multiple applications require network access, the system should maintain strict separation between their respective communication channels. However, this logic flaw allows for cross-process network interception where an application can capture or redirect traffic intended for a different process, effectively breaking the expected security boundaries that protect user data and application integrity.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential data breaches, credential theft, and system compromise. Attackers could exploit this weakness to intercept sensitive communications such as authentication tokens, personal information transfers, or proprietary data exchanges between applications. The implications are particularly severe in enterprise environments where multiple applications process confidential information and rely on proper network isolation for security. This vulnerability directly relates to common attack patterns described in the attack mitigation framework under techniques involving network sniffing and process hijacking.
The fix implemented by apple addresses this issue through enhanced access controls and improved validation of network connection contexts. The updates released for macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6 introduce stricter enforcement of inter-process network boundaries. These patches likely implement additional checks during network connection establishment and modification processes to ensure that applications cannot access connections belonging to other processes without proper authorization.
From a compliance perspective, this vulnerability aligns with several cybersecurity frameworks and standards including those addressing data protection requirements and process isolation principles. The fix demonstrates adherence to secure coding practices that prevent unauthorized access patterns and maintain proper system boundaries as outlined in various security control models. Organizations should prioritize deployment of these updates to mitigate potential exploitation risks and maintain their security posture against sophisticated attack vectors targeting network communication integrity.
The resolution of this issue reinforces fundamental security concepts around process isolation, network segmentation, and access control enforcement that are critical components of modern operating system security architectures. Proper implementation of these controls prevents unauthorized access patterns while maintaining legitimate application functionality and user experience. Security teams should monitor for any potential exploitation attempts related to this vulnerability and ensure comprehensive testing of the updated systems to validate proper implementation of the security controls.