A libx11 security update has been released for Debian GNU/Linux 11 and 12 to address multiple security vulnerabilities.

[SECURITY] [DSA 5517-1] libx11 security update

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Debian Security Advisory DSA-5517-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
October 05, 2023 https://www.debian.org/security/faq
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Package : libx11
CVE ID : CVE-2023-43785 CVE-2023-43786 CVE-2023-43787

Multiple security vulnerabilities were discovered in libx11, the X11
client-side library, which may result in denial of service or the
execution of arbitrary code.

For the oldstable distribution (bullseye), these problems have been fixed
in version 2:1.7.2-1+deb11u2.

For the stable distribution (bookworm), these problems have been fixed in
version 2:1.8.4-2+deb12u2.

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/