An issue was discovered in ytnef before 1.9.2. An invalid memory access (heap-based buffer over-read) can occur during handling of LONG data types, related to MAPIPrint() in libytnef.
https://github.com/Yeraze/ytnef/issues/28
https://github.com/Yeraze/ytnef/commit/f98f5d4adc1c4bd4033638f6167c1bb95d642f89