CVE-2026-43777

7.5

Apple · macOS

A vulnerability in Apple macOS allows a remote, unauthenticated attacker to trigger a denial of service condition through insufficient input validation.

Executive summary

A remote denial of service vulnerability in Apple macOS poses a significant availability risk to unpatched systems.

Vulnerability

The vulnerability is caused by improper input validation, which can be exploited by an unauthenticated remote attacker to crash the system or render it unresponsive. The CVSS vector (AV:N/AC:L/PR:N/UI:N) confirms that no user interaction or prior authentication is required to initiate the attack.

Business impact

The primary risk associated with this vulnerability is the disruption of business operations due to system instability or service outage. With a CVSS score of 7.5, this high severity flaw could lead to significant downtime for critical infrastructure, impacting organizational productivity and service availability.

Remediation

Immediate Action: Update all affected macOS installations to Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6 immediately to apply the necessary input validation fixes.

Proactive Monitoring: Monitor system logs for unusual spikes in resource consumption or unexpected kernel panics that may indicate an attempt to trigger this denial of service condition.

Compensating Controls: Ensure that network-level security controls, such as firewalls and intrusion prevention systems, are configured to restrict unauthorized traffic to vulnerable services where possible.

Exploitation status

Public Exploit Available: No (exploit_available: false)

Analyst recommendation

Given the ease of exploitation and the potential for service disruption, administrators should prioritize the deployment of the provided security updates across all managed Apple devices. Patching remains the only definitive method to remediate this vulnerability and restore system availability protections.

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Sources