Merge branch 'master' into 'master'

fix three potential vulnerabilities.

See merge request !33
4 jobs for master in 3 minutes and 22 seconds
Status Job ID Name Coverage
  Build
passed #98508905
autoconf

00:03:22

passed #98508906
cmake-makefiles

00:01:56

passed #98508907
cmake-ninja

00:01:42

 
  External
passed continuous-integration/appveyor/branch