A libx11 security update has been released for Debian GNU/Linux 11 and 12 to address missing input validations.

[SECURITY] [DSA 5433-1] libx11 security update

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Debian Security Advisory DSA-5433-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
June 21, 2023 https://www.debian.org/security/faq
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Package : libx11
CVE ID : CVE-2023-3138
Debian Bug : 1038133

Gregory James Duck reported that missing input validation in various
functions provided by libx11, the X11 client-side library, may result in
denial of service.

For the oldstable distribution (bullseye), this problem has been fixed
in version 2:1.7.2-1+deb11u1.

For the stable distribution (bookworm), this problem has been fixed in
version 2:1.8.4-2+deb12u1.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/