The best patch for 7-Zip is uninstalling it (on most of your PCs)
CVE-2026-14266 is a heap overflow in 7-Zip's XZ decoder: it affects version 21.07 and every release up to 26.01. With no public exploit and no known exploitation, it is not an emergency. But that is two code-execution flaws in two months, the program updates by hand, and Windows 11 has opened .7z and .rar natively since 2023. Before updating two hundred machines, it is worth checking how many actually need it.