A libsdl2 security update has been released for Debian GNU/Linux 9 LTS to address a vulnerability.

DLA 2803-1: libsdl2 security update

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Debian LTS Advisory DLA-2803-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
October 31, 2021   https://wiki.debian.org/LTS
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Package : libsdl2
Version : 2.0.5+dfsg1-2+deb9u2
CVE ID : CVE-2017-2888 CVE-2019-7637
Debian Bug : 878264

A vulnerability has been fixed in libsdl2, the newer version of the
Simple DirectMedia Layer library that provides low level access to
audio, keyboard, mouse, joystick, and graphics hardware.

CVE-2017-2888
CVE-2019-7637

Potential overflow in surface allocation was fixed.

For Debian 9 stretch, these problems have been fixed in version
2.0.5+dfsg1-2+deb9u2.

We recommend that you upgrade your libsdl2 packages.

For the detailed security status of libsdl2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libsdl2

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