The Critical Patch Update for October 2016 was released on October 18th, 2016. Oracle strongly recommends applying the patches as soon as possible. 

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http://www.oracle.com/us/dm/sev100575522-na-ww-ot-de1-ev-3253663.html?elq_mid=59973&sh=0802222319060808261813292520100701&cmid=SPPT160711P00036