Another python3.4 update has been released for Debian GNU/Linux 8 LTS to address a regression introduced by the previous update

Package : python3.4
Version : 3.4.2-1+deb8u4
CVE ID : CVE-2019-9740 CVE-2019-9947
Debian Bug : 931044


The update issued as DLA-1835-1 caused a regression in the http.client
library in Python 3.4 which was broken by the patch intended to fix
CVE-2019-9740 and CVE-2019-9947.

For Debian 8 "Jessie", this problem has been fixed in version
3.4.2-1+deb8u4.

We recommend that you upgrade your python3.4 packages.

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

  Python3.4 Regression Update for Debian 8 LTS