unrarlib.c in unrar-free 0.0.1, when _DEBUG_LOG mode is enabled, might allow remote attackers to cause a denial of service (stack-based buffer overflow and application crash) or possibly have unspecified other impact via an RAR archive containing a long filename.
https://github.com/0x09AL/my-exploits/blob/master/pocs/unrar-free/buffer-overflow/DESCRIPTION