An issue was discovered in Qt before 5.11.3. A malformed GIF image causes a NULL pointer dereference in QGifHandler resulting in a segmentation fault.Referenceshttps://codereview.qt-project.org/#/c/235998/https://www.debian.org/security/2019/dsa-4374https://lists.debian.org/debian-lts-announce/2019/01/msg00004.htmlhttps://blog.qt.io/blog/2018/12/04/qt-5-11-3-released-important-security-updates/http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00080.htmlhttps://lists.debian.org/debian-lts-announce/2019/05/msg00014.htmlhttps://usn.ubuntu.com/4003-1/https://access.redhat.com/errata/RHSA-2019:2135https://access.redhat.com/errata/RHSA-2019:3390https://lists.debian.org/debian-lts-announce/2020/09/msg00023.html
