A curl security update has been released for Debian GNU/Linux 9 LTS to address a rare issue when using the multi API of curl in combination with CURLOPT_CONNECT_ONLY.

DLA 2382-1: curl security update

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Debian LTS Advisory DLA-2382-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
September 26, 2020   https://wiki.debian.org/LTS
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Package : curl
Version : 7.52.1-5+deb9u12
CVE ID : CVE-2020-8231

An issue has been found in curl, a command line tool for transferring data
with URL syntax.
In rare circumstances, when using the multi API of curl in combination
with CURLOPT_CONNECT_ONLY, the wrong connection might be used when
transfering data later.

For Debian 9 stretch, this problem has been fixed in version
7.52.1-5+deb9u12.

We recommend that you upgrade your curl packages.

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

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