A qt4-x11 security update has been released for Debian GNU/Linux 9 LTS to address several vulnerabilities in the legacy version of the Qt toolkit.

DLA 2377-1: qt4-x11 security update

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Debian LTS Advisory DLA-2377-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
September 21, 2020   https://wiki.debian.org/LTS
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Package : qt4-x11
Version : 4:4.8.7+dfsg-11+deb9u1
CVE ID : CVE-2018-15518 CVE-2018-19869 CVE-2018-19870 CVE-2018-19871
CVE-2018-19872 CVE-2018-19873 CVE-2020-17507
Debian Bug : 923003 970308

Several vulnerabilities were fixed in qt4-x11, the legacy version
of the Qt toolkit.

CVE-2018-15518

Double-free or corruption in QXmlStreamReader during parsing of a
specially crafted illegal XML document.

CVE-2018-19869

A malformed SVG image causes a segmentation fault.

CVE-2018-19870

A malformed GIF image causes a NULL pointer dereference in
QGifHandler resulting in a segmentation fault.

CVE-2018-19871

Uncontrolled Resource Consumption in QTgaFile.

CVE-2018-19872

A malformed PPM image causes a crash.

CVE-2018-19873

QBmpHandler segfault on malformed BMP file.

CVE-2020-17507

Buffer over-read in the XBM parser.

For Debian 9 stretch, these problems have been fixed in version
4:4.8.7+dfsg-11+deb9u1.

We recommend that you upgrade your qt4-x11 packages.

For the detailed security status of qt4-x11 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/qt4-x11

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS