> why can using cpio be a security risk? (i'm using "cpio (GNU cpio) 2.7")

cpio can be tricked to decode multiple archive components into the same file,
overwriting previous contents, which could help in camouflaging a virus.
pax has options which can reduce the problem to large extent (including
some other implications of the same), although it still is not perfect
for the job. tar is very much nonstandard and limited in formats it supports
compared to pax.

> if so, which pax version is advisable to choose?

If your OS comes with it, it should do (unless it is ancient).
Otherwise compile it from source, or use a heirloom version,
which is quite good.

  Mark

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