A gnutls28 security update has been released for Debian GNU/Linux 11 to address a timing side channel in the RSA decryption implementation of the GNU TLS library.

DSA 5349-1: gnutls28 security update

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Debian Security Advisory DSA-5349-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 14, 2023   https://www.debian.org/security/faq
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Package : gnutls28
CVE ID : CVE-2023-0361

Hubert Kario discovered a timing side channel in the RSA decryption
implementation of the GNU TLS library.

For the stable distribution (bullseye), this problem has been fixed in
version 3.7.1-5+deb11u3.

We recommend that you upgrade your gnutls28 packages.

For the detailed security status of gnutls28 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/gnutls28

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/