CVE-2025-43255 is an out-of-bounds read vulnerability in macOS that could allow an application to cause unexpected system termination. The issue is addressed by improved bounds checking and is fixed in macOS Sonoma 14.7.7, macOS Sequoia 15.6, and macOS Ventura 13.7.7. The vulnerability has a low severity rating and does not impact confidentiality or integrity, only availability.