An agg security update has been released for Debian GNU/Linux 9 LTS to address a stack overflow.

DLA 2872-1: agg security update

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Debian LTS Advisory DLA-2872-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
December 31, 2021   https://wiki.debian.org/LTS
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Package : agg
Version : 2.5+dfsg1-11+deb9u1
CVE ID : CVE-2019-6245
Debian Bug : 919322

Stack overflow due to infinite recursion was fixed in agg,
the Anti-Grain Geometry graphical toolkit.

For Debian 9 stretch, this problem has been fixed in version
2.5+dfsg1-11+deb9u1.

We recommend that you upgrade your agg packages.

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

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