busybox 1.38.0, as shipped in Parted Magic's initramfs (busybox-1.38.0-x86_64-1_pmagic).

  busybox-1.38.0.tar.bz2      upstream release, https://busybox.net/downloads/
  busybox-1.38.0.tar.bz2.sig  upstream signature
  busybox-1.38.0.config       the configuration the shipped binary was built
                              with, read out of that binary with
                              `busybox bbconfig` (2026-10-20)

To build: unpack the tarball, copy busybox-1.38.0.config to .config in the
source directory, then run `make oldconfig` and `make`.  The result is the
busybox binary, installed as /bin/busybox.