Upstream: http://www.dre.vanderbilt.edu/~schmidt/ACE.html In bin/generate_doxygen.pl line 177 it says: my $output = "/tmp/".$i.".".$$.".doxygen"; This path is later opened for writing. For context, see: http://sources.debian.net/src/ace/6.2.7%2Bdfsg-1/bin/generate_doxygen.pl/#L177 Initial disclosure: http://bugs.debian.org/760709 (end of CVE request) A quick "grep -r /tmp $ace_source" indicates more occasions that may be worth researching. Most of the results reside within examples or documentation though. An interesting find is bin/g++-dep line 63: TMP=/tmp/g++dep$$ This path is also used for writing. The context can be found at: http://sources.debian.net/src/ace/6.2.7%2Bdfsg-1/bin/g%2B%2Bdep/#L63 I am not sure whether instance is actually executed during the build, but the Debian package installs it to the development package available for user consumption. Thanks Helmut