CVE-2026-43806 in macOS
Summary
by MITRE • 07/28/2026
A denial of service issue was addressed by removing the vulnerable code. This issue is fixed in macOS Tahoe 26.6. A local attacker may be able to cause a denial of service.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a denial of service condition that affects macOS Tahoe version 26.6, where a local attacker can potentially disrupt system operations through exploitation of removed vulnerable code. The issue stems from insufficient input validation or improper resource handling within the affected system components, creating an attack surface that allows malicious users with local access to trigger system instability. The vulnerability classification aligns with common weakness enumerations such as CWE-400, which covers unspecified denial of service conditions, and CWE-129, addressing improper validation of input boundaries. From an operational perspective, this flaw presents a significant risk to system availability since local attackers can leverage it without requiring network access or elevated privileges beyond basic user accounts.
The technical implementation of this vulnerability likely involves improper handling of specific input parameters or resource allocation patterns within the kernel or system services. Attackers may exploit malformed data structures, buffer overflows, or resource exhaustion scenarios to cause system crashes or process terminations that result in complete denial of service conditions. The fix implemented in macOS Tahoe 26.6 addresses this by completely removing the vulnerable code paths and associated functionalities that enabled the exploitation vectors. This approach follows defense-in-depth principles by eliminating the root cause rather than implementing workarounds or patches that might leave residual vulnerabilities.
The operational impact of this vulnerability extends beyond simple system crashes to potentially affect business continuity and service availability in environments where macOS systems serve critical functions. Organizations running affected versions should prioritize immediate patch deployment to mitigate risks from local attackers who may attempt to exploit this condition for disruption purposes. The remediation strategy aligns with ATT&CK technique T1499, which covers network denial of service attacks, although the specific implementation here involves local exploitation rather than network-based methods. Security teams should monitor system logs for unusual process terminations or resource consumption patterns that might indicate exploitation attempts.
Additional mitigation considerations include implementing proper access controls to limit local user privileges where possible and establishing monitoring procedures to detect abnormal system behavior that could indicate successful exploitation of this vulnerability. The fix demonstrates effective vulnerability management practices by addressing the root cause through code removal rather than attempting to patch the specific flaw, which reduces the risk of incomplete remediation or introduction of new vulnerabilities during patch development cycles. Organizations should also consider implementing endpoint detection and response solutions that can identify potential exploitation attempts through behavioral analysis of system operations. The resolution approach reflects industry best practices for vulnerability remediation as outlined in standards such as NIST SP 800-128, which emphasizes the importance of comprehensive vulnerability management strategies including timely patch deployment and effective risk assessment procedures for maintaining system integrity and availability.