Provide references for CVE-2017-18185.
Where can I find more information about CVE-2017-18185?
References are available at: https://github.com/qpdf/qpdf/commit/ec7d74a386c0b2f38990079c3b0d2a2b30be0e71, https://usn.ubuntu.com/3638-1/, https://github.com/qpdf/qpdf/issues/150.