Advisory Details

March 10th, 2026

Apple macOS libusd_ms Alembic File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

CVE ID	CVE-2026-20616
CVSS SCORE	7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Apple
AFFECTED PRODUCTS	macOS
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple macOS. User interaction is required to exploit this vulnerability in that the target must receive a malicious file that is written to the local filesystem. The specific flaw exists within the parsing of Alembic files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of the current process.
ADDITIONAL DETAILS	Apple has issued an update to correct this vulnerability. More details can be found at: https://support.apple.com/en-ca/126350
DISCLOSURE TIMELINE	2025-11-19 - Vulnerability reported to vendor 2026-03-10 - Coordinated public release of advisory 2026-03-10 - Advisory Updated
CREDIT	Michael DePlante (@izobashi) of Trend Zero Day Initiative

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