CVE-2026-84579 is a logic issue in macOS that could lead to unexpected software execution when opening a file referencing a network share. The issue has been fixed in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. It has a high severity with a CVSS score of 8.8, indicating a network attack vector with low complexity and no privileges required but user interaction needed.