CC'ing kernel@g.o as well since patch got updated (available for 2.6.27 as well).
Updated ebuild which fixes bug #233939 as well can be pulled from my overlay: http://git.overlays.gentoo.org/gitweb/?p=dev/dev-zero.git;a=tree;f=sys-fs/squashfs-tools;hb=HEAD
Go ahead an update it yourself. This was maintained by wolf31o2, who is now retired.
Indeed. I see nothing wrong with bumping the tools versions, and as Andrew said, I can't do it, anymore.