CVE-2025-43464: 
macOS vulnerability analysis and mitigation

CVE-2025-43464 is a denial-of-service vulnerability in Apple macOS affecting the dyld (dynamic linker) component. The flaw allows a remote attacker to trigger an app denial-of-service when a user visits a specially crafted website. It affects macOS versions prior to Tahoe 26.1 and was fixed in macOS Tahoe 26.1, released November 3, 2025. The CVE was publicly disclosed on December 12, 2025, with a CVSS v3.1 base score of 6.5 (Medium) (Apple Advisory, Feedly).

The vulnerability is classified as CWE-20 (Improper Input Validation) and resides in the dyld dynamic linker component of macOS. An attacker can exploit this by hosting a malicious website that delivers crafted input capable of triggering improper handling within dyld, leading to an application denial-of-service on the visiting user's system. No user privileges are required on the attacker's side, but user interaction (visiting the malicious site) is necessary. Apple addressed the issue with improved input validation in macOS Tahoe 26.1. The vulnerability was discovered by researchers Duy Trần (@khanhduytran0) and @EthanArbuckle (Apple Advisory).

Successful exploitation causes an application denial-of-service on the affected macOS system when the user visits a malicious website. The impact is limited to availability — there is no confidentiality or integrity impact, and the scope is unchanged (confined to the affected application). Lateral movement and data exfiltration are not associated with this vulnerability (Apple Advisory, Feedly).

No public proof-of-concept exploit code or active in-the-wild exploitation has been reported for CVE-2025-43464. The EPSS score is approximately 0.018% (0.000180), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been identified (Feedly).

Apple has released a fix in macOS Tahoe 26.1 (released November 3, 2025). Users and administrators should update all affected macOS systems to version 26.1 or later as the primary remediation. No configuration-based workarounds have been published by Apple. Organizations unable to update immediately should consider restricting access to untrusted websites on affected systems as a temporary risk-reduction measure (Apple Advisory).

CVE-2025-43464 appeared in a Reddit CVEWatch post listing top trending CVEs for the week of November 7, 2025, indicating modest community interest. The SANS Internet Storm Center also referenced the vulnerability in a diary entry shortly after disclosure. Overall, industry and media reaction has been limited given the medium severity and lack of active exploitation (Reddit CVEWatch, SANS ISC).