A libspf2 security update has been released for Debian GNU/Linux 9 LTS to address two issues related to heap-based buffer overflows.

DLA 2890-1: libspf2 security update

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Debian LTS Advisory DLA-2890-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
January 21, 2022   https://wiki.debian.org/LTS
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Package : libspf2
Version : 1.2.10-7+deb9u2
CVE ID : CVE-2021-33912 CVE-2021-33913

Two issues have been found in libspf2, a library for validating mail
senders with SPF.
Both issues are related to heap-based buffer overflows.

For Debian 9 stretch, these problems have been fixed in version
1.2.10-7+deb9u2.

We recommend that you upgrade your libspf2 packages.

For the detailed security status of libspf2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libspf2

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS