An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in mbcenclen() during regular expression searching. Invalid handling of reg->dmin in forwardsearchrange() could result in an invalid pointer dereference, as an out-of-bounds read from a stack buffer.