A bind9 security update has been released for Debian GNU/Linux 11 and 12 to address several vulnerabilities.

[SECURITY] [DSA 5439-1] bind9 security update

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Debian Security Advisory DSA-5439-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
June 25, 2023 https://www.debian.org/security/faq
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Package : bind9
CVE ID : CVE-2023-2828 CVE-2023-2911

Several vulnerabilities were discovered in BIND, a DNS server
implementation.

CVE-2023-2828

Shoham Danino, Anat Bremler-Barr, Yehuda Afek and Yuval Shavitt
discovered that a flaw in the cache-cleaning algorithm used in named
can cause that named's configured cache size limit can be
significantly exceeded, potentially resulting in denial of service.

CVE-2023-2911

It was discovered that a flaw in the handling of recursive-clients
quota may result in denial of service (named daemon crash).

For the oldstable distribution (bullseye), these problems have been fixed
in version 1:9.16.42-1~deb11u1.

For the stable distribution (bookworm), these problems have been fixed in
version 1:9.18.16-1~deb12u1.

We recommend that you upgrade your bind9 packages.

For the detailed security status of bind9 please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/bind9

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/