Language: Go
Label: vulnerable
CWE: CWE-22 \u2014 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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.

Code:
func unzipFile(file *zip.File, dstDir string) error {
	// create the directory of file
	filePath := path.Join(dstDir, file.Name)
	if file.FileInfo().IsDir() {
		if err := os.MkdirAll(filePath, os.ModePerm); err != nil {
			return err
		}
		return nil
	}
	if err := os.MkdirAll(filepath.Dir(filePath), os.ModePerm); err != nil {
		return err
	}

	// open the file
	r, err := file.Open()
	if err != nil {
		return err
	}
	defer r.Close()

	// create the file
	w, err := os.Create(filePath)
	if err != nil {
		return err
	}
	defer w.Close()

	// save the decompressed file content
	_, err = io.Copy(w, r)
	return err
}