A libexif security update has been released for both Debian GNU/Linux 9 and 10 to address a denial of service issue.

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Debian Security Advisory DSA-4618-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
February 06, 2020   https://www.debian.org/security/faq
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Package : libexif
CVE ID : CVE-2019-9278
Debian Bug : 945948

An out-of-bounds write vulnerability due to an integer overflow was
reported in libexif, a library to parse EXIF files, which could result
in denial of service, or potentially the execution of arbitrary code if
specially crafted image files are processed.

For the oldstable distribution (stretch), this problem has been fixed
in version 0.6.21-2+deb9u1.

For the stable distribution (buster), this problem has been fixed in
version 0.6.21-5.1+deb10u1.

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