Debian Security Advisory

DLA-2377-1 qt4-x11 -- LTS security update

Date Reported:
28 Sep 2020
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2018-15518, CVE-2018-19869, CVE-2018-19870, CVE-2018-19871, CVE-2018-19872, CVE-2018-19873, CVE-2020-17507.
More information:

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:

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