An issue was discovered in ytnef before 1.9.2. There is a potential heap-based buffer over-read on incoming Compressed RTF Streams, related to DecompressRTF() in libytnef.
https://github.com/Yeraze/ytnef/issues/34
https://github.com/Yeraze/ytnef/commit/22f8346c8d4f0020a40d9f258fdb3bfc097359cc