Gnulib before 2017-04-26 has a heap-based buffer overflow with the TZ environment variable. The error is in the save_abbr function in time_rz.c.
https://security-tracker.debian.org/tracker/CVE-2017-7476
https://bugzilla.redhat.com/show_bug.cgi?id=1445185
https://bugzilla.redhat.com/show_bug.cgi?id=1444774