path-sanitizer is a simple lightweight npm package for sanitizing paths to prevent Path Traversal. Prior to 3.1.0, the filters can be bypassed using .=%5c which results in a path traversal. This vulnerability is fixed in 3.1.0.
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.