CVE-2018-11771 update

[ruebot]

GitHub issue(s): N/A

What does this Pull Request do?

Yet another security vulnerability

How should this be tested?

TravisCI should take care of it.

[codecov-io]

Codecov Report

Merging #288 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #288   +/-   ##
=======================================
  Coverage   70.36%   70.36%           
=======================================
  Files          41       41           
  Lines        1046     1046           
  Branches      192      192           
=======================================
  Hits          736      736           
  Misses        244      244           
  Partials       66       66

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