Provide references for CVE-2018-21009.
Where can I find more information about CVE-2018-21009?
References are available at: https://gitlab.freedesktop.org/poppler/poppler/commit/0868c499a9f5f37f8df5c9fef03c37496b40fc8a, https://lists.debian.org/debian-lts-announce/2019/09/msg00033.html, https://lists.debian.org/debian-lts-announce/2020/07/msg00018.html.