A pillow security update has been released for Debian GNU/Linux 9 LTS to address multiple out-of-bounds issues.

DLA 2317-1: pillow security update

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Debian LTS Advisory DLA-2317-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
August 08, 2020   https://wiki.debian.org/LTS
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Package : pillow
Version : 4.0.0-4+deb9u2
CVE ID : CVE-2020-10177

It was noticed that in Pillow before 7.1.0, there are multiple
out-of-bounds reads in libImaging/FliDecode.c.

For Debian 9 stretch, this problem has been fixed in version
4.0.0-4+deb9u2.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS