The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
The maintainer script seems to access a file in
some other temporary directory. Since creating temporary files in a
world-writable directory is very dangerous, this is likely to be a
security bug. Use the
mktemp utilities to
create temporary files in these directories.
Please refer to Debian Policy Manual section 10.4 for details.