Path traversal vulnerability exists in UTAU versions prior to v0.4.19. If a user of the product installs a crafted UTAU voicebank installer (.uar file, .zip file) to UTAU, an arbitrary file may be placed.
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.