GHSA-2CXP-XQ3C-MJXX uutils coreutils' mktemp utility doesn't properly handle an empty TMPDIR environment variable

The mktemp utility in uutils coreutils fails to properly handle an empty TMPDIR environment variable. Unlike GNU mktemp, which falls back to /tmp when TMPDIR is an empty string, the uutils implementation treats the empty string as a valid path. This causes temporary files to be created in the...