A pillow security update has been released for both Debian GNU/Linux 9 and 10 to address multiple security issues.

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Debian Security Advisory DSA-4631-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 21, 2020   https://www.debian.org/security/faq
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Package : pillow
CVE ID : CVE-2019-16865 CVE-2019-19911 CVE-2020-5311
CVE-2020-5312 CVE-2020-5313

Multiple security issues were discovered in Pillow, a Python imaging
library, which could result in denial of service and potentially the
execution of arbitrary code if malformed PCX, FLI, SGI or TIFF images
are processed.

For the oldstable distribution (stretch), these problems have been fixed
in version 4.0.0-4+deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 5.4.1-2+deb10u1.

We recommend that you upgrade your pillow packages.

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

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/