A libx11 security update has been released for Debian GNU/Linux 9 LTS to address some integer overflows, which could lead to heap corruption when processing crafted messages from an input method.

DLA 2312-1: libx11 security update

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Debian LTS Advisory DLA-2312-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
August 04, 2020   https://wiki.debian.org/LTS
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Package : libx11
Version : 2:1.6.4-3+deb9u2
CVE ID : CVE-2020-14344

Todd Carson discovered some integer overflows in libX11, which could
lead to heap corruption when processing crafted messages from an input
method.

For Debian 9 stretch, this problem has been fixed in version
2:1.6.4-3+deb9u2.

We recommend that you upgrade your libx11 packages.

For the detailed security status of libx11 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libx11

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