Comment # 3 on bug 1129501 from Neil Rickert

I'm not sure, but this may be the same problem as in bug 1127849

Most people who run into this see it with "zypper" rather than Yast.  The
segfault occurs when downloading packages (or repo metadata), so I think that's
what you are seeing.

It should be fixed if you are fully up-to-date.

Maybe run:  zypper update libcurl4
to fix the bug.

The correct way to update Tumbleweed is:

zypper dup

If you are updating with Yast, it is possible that you are not fully updated. 
Maybe try
zypper dup
at a root terminal.  At least try a test run (you can add "--dry-run" to the
end of the command), to see what changes it wants to make.