Directory traversal vulnerability in libtransmission/metainfo.c in Transmission 1.22, 1.34, 1.75, and 1.76 allows remote attackers to overwrite arbitrary files via a .. (dot dot) in a pathname within a .torrent file.
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.