An opendmarc security update has been released for Debian GNU/Linux 8 Extended LTS to address security issues.

DLA 2639-1: opendmarc security update

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Debian LTS Advisory DLA-2639-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
April 25, 2021   https://wiki.debian.org/LTS
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Package : opendmarc
Version : 1.3.2-2+deb9u3
CVE ID : CVE-2020-12460
Debian Bug : 966464

It was discovered that OpenDMARC, a milter implementation of DMARC,
has improper null termination in the function opendmarc_xml_parse that
can result in a one-byte heap overflow in opendmarc_xml when parsing a
specially crafted DMARC aggregate report. This can cause remote memory
corruption when a '\0' byte overwrites the heap metadata of the next
chunk and its PREV_INUSE flag.

For Debian 9 stretch, this problem has been fixed in version
1.3.2-2+deb9u3.

We recommend that you upgrade your opendmarc packages.

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

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