A mutt security update has been released for Debian GNU/Linux 9 LTS to address an issue that can result in authentication credentials being exposed or man-in-the-middle attacks.

DLA 2472-1: mutt security update

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Debian LTS Advisory DLA-2472-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
November 30, 2020   https://wiki.debian.org/LTS
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Package : mutt
Version : 1.7.2-1+deb9u4
CVE ID : CVE-2020-28896
Debian Bug :

In Mutt, a text-based Mail User Agent, invalid IMAP server responses
were not properly handled, potentially resulting in authentication
credentials being exposed or man-in-the-middle attacks.

For Debian 9 stretch, this problem has been fixed in version
1.7.2-1+deb9u4.

We recommend that you upgrade your mutt packages.

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

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