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In RHEL 7, we have an alpha version xz-5.1.2alpha.  Upstream released xz-5.2.0
(stable) in December 2014.  I've done exactly this update in Fedora recently
and there seem to be no issues so far (see the bug #1023718 for more info, abi
compatibility analysis, etc).

Probably we could rebase xz also in RHEL7, there have been quite a few bugs
fixed and new features added.  Without big risk, RHEL7 could benefit from
having stable (non pre-release) version of xz.

http://www.mail-archive.com/xz-devel@tukaani.org/msg00226.html

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHEA-2016-2198.html