A libproxy security update has been released for Debian GNU/Linux 9 LTS to address a denial of service attack in libproxy.

DLA 2372-1: libproxy security update

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Debian LTS Advisory DLA-2372-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
September 12, 2020   https://wiki.debian.org/LTS
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Package : libproxy
Version : 0.4.14-2+deb9u1
CVE ID : CVE-2020-25219

It was discovered that there was a denial of service attack in
libproxy, a library to make applications HTTP proxy aware. A remote
server could cause an infinite stack recursion.

For Debian 9 "Stretch", this problem has been fixed in version
0.4.14-2+deb9u1.

We recommend that you upgrade your libproxy packages.

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

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