A libexif security update has been released for Debian GNU/Linux 9 LTS to address a possible buffer overflow issue.

DLA 2439-1: libexif security update

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Debian LTS Advisory DLA-2439-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
November 07, 2020   https://wiki.debian.org/LTS
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Package : libexif
Version : 0.6.21-2+deb9u5
CVE ID : CVE-2020-0452

In libexif/exif-entry.c, through libexif 0.6.21-2+deb9u4,
compiler optimization could remove a buffer overflow check,
making a buffer overflow possible with some EXIF tags.

For Debian 9 stretch, this problem has been fixed in version
0.6.21-2+deb9u5.

We recommend that you upgrade your libexif packages.

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

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