Provide references for CVE-2017-18184.
Where can I find more information about CVE-2017-18184?
References are available at: https://usn.ubuntu.com/3638-1/, https://github.com/qpdf/qpdf/commit/dea704f0ab7f625e1e7b3f9a1110b45b63157317, https://github.com/qpdf/qpdf/issues/147.