QXmlStream in Qt 5.x before 5.11.3 has a double-free or corruption during parsing of a specially crafted illegal XML document.

References

• advisory https://access.redhat.com/errata/RHSA-2019:2135
• advisory https://access.redhat.com/errata/RHSA-2019:3390
• advisory https://blog.qt.io/blog/2018/12/04/qt-5-11-3-released-important-security-updates/
• advisory https://lists.debian.org/debian-lts-announce/2019/01/msg00004.html
• advisory https://www.debian.org/security/2019/dsa-4374
• patch http://lists.opensuse.org/opensuse-security-announce/2018-12/msg00066.html
• patch https://codereview.qt-project.org/#/c/236691/
• web http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00057.html
• web http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00071.html
• web http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00073.html
• web http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00090.html
• web https://lists.debian.org/debian-lts-announce/2019/05/msg00014.html
• web https://lists.debian.org/debian-lts-announce/2020/09/msg00023.html
• web https://usn.ubuntu.com/4003-1/