This update for php53 fixes the following issues: Security issues fixed: - CVE-2017-16642: Fix timelib_meridian error that could be used to leak information from the interpreter . - CVE-2017-9228: Fix heap out-of-bounds write that occurs in bitset_set_range during regex compilation . - CVE-2017-9229: Fix invalid pointer dereference in left_adjust_char_head .