How can I repack zip to 7zip?

How can I safely and quickly repack a zip archive to a 7zip archive? I checked options of 7zip program but I don't see any option to repack. I know I can extract to directory and then pack this directory but is it safe? What if ZIP has paths like "../../file.exe" or "/etc/bin/file.exe"? I tried unpacking files to stdout and while program 7zip can do this it outputs just content of files without their names etc. so I cannot just grab this output and redirect somewhere to pack into a 7zip archive.