A libx11 security update has been released for Debian GNU/Linux 10 LTS to address a missing input validation.

[SECURITY] [DLA 3472-1] libx11 security update

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Debian LTS Advisory DLA-3472-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Adrian Bunk
June 26, 2023 https://wiki.debian.org/LTS
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Package : libx11
Version : 2:1.6.7-1+deb10u3
CVE ID : CVE-2023-3138
Debian Bug : 1038133

Missing input validation in various functions may have resulted in
denial of service in various functions provided by libx11, the X11
client-side library.

For Debian 10 buster, this problem has been fixed in version
2:1.6.7-1+deb10u3.

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