It was discovered that OpenDMARC, a milter implementation of DMARC, is prone to a signature-bypass vulnerability with multiple From: addresses. For the oldstable distribution (stretch), this problem has been fixed

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Debian Security Advisory DSA-4526-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
September 19, 2019                    https://www.debian.org/security/faq
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Package        : opendmarc
CVE ID         : CVE-2019-16378
Debian Bug     : 940081

It was discovered that OpenDMARC, a milter implementation of DMARC, is
prone to a signature-bypass vulnerability with multiple From: addresses.

For the oldstable distribution (stretch), this problem has been fixed
in version 1.3.2-2+deb9u2.

For the stable distribution (buster), this problem has been fixed in
version 1.3.2-6+deb10u1.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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