case 'j': /* day of the year, 001 - 366 */
FMT('0', 3, "d", vtm->yday);
continue;
The range for the vtm->yday function is not checked as many of the other values are before formatting. The end result allows the day of year to be up to the size of a ushort.
This issue was solved with changeset r40165.
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strftime.c (rb_strftime_with_timespec): Test yday range. [ruby-core:44088] [Bug #6247] reported by Ruby Submit.