This update for libidn fixes the following issues:
CVE-2016-6262 and CVE-2015-8948: Out-of-bounds-read when reading one zero byte as input (bsc#990189)
CVE-2016-6261: Out-of-bounds stack read in idnatoascii_4i (bsc#990190)
CVE-2016-6263: stringpreputf8nfkc_normalize reject invalid UTF-8 (bsc#990191)
CVE-2015-2059: out-of-bounds read with stringprep on invalid UTF-8 (bsc#923241)