A python3.5 security update has been released for Debian GNU/Linux 9 LTS.

DLA 2456-1: python3.5 security update

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Debian LTS Advisory DLA-2456-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Roberto C. Sánchez
November 18, 2020   https://wiki.debian.org/LTS
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Package : python3.5
Version : 3.5.3-1+deb9u3
CVE ID : CVE-2019-20907 CVE-2020-26116
Debian Bug :

Multiple security issues were discovered in Python.

CVE-2019-20907

In Lib/tarfile.py, an attacker is able to craft a TAR
archive leading to an infinite loop when opened by tarfile.open,
because _proc_pax lacks header validation

CVE-2020-26116

http.client allows CRLF injection if the attacker controls
the HTTP request method

For Debian 9 stretch, these problems have been fixed in version
3.5.3-1+deb9u3.

We recommend that you upgrade your python3.5 packages.

For the detailed security status of python3.5 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/python3.5

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