A libssh security update has been released Debian GNU/Linux 11 to address two security issues.

DSA 5409-1: libssh security update

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Debian Security Advisory DSA-5409-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 23, 2023   https://www.debian.org/security/faq
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Package : libssh
CVE ID : CVE-2023-1667 CVE-2023-2283
Debian Bug : 1035832

Two security issues have been discovered in libssh, a tiny C SSH library:

CVE-2023-1667

Philip Turnbull discovered a NULL pointer dereference which could
result in denial of service.

CVE-2023-2283

Kevin Backhouse discovered that pki_verify_data_signature() may
fail to correctly validate authentication in memory pressure
situations.

For the stable distribution (bullseye), these problems have been fixed in
version 0.9.7-0+deb11u1.

We recommend that you upgrade your libssh packages.

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

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/