A zsh security update has been released for Debian GNU/Linux 8 LTS to address privilege escalation vulnerability.

Package : zsh
Version : 5.0.7-5+deb8u1
CVE ID : CVE-2019-20044
Debian Bug : 951458

A privilege escalation vulnerability was discovered in zsh, a shell with
lots of features, whereby a user could regain a formerly elevated
privelege level even when such an action should not be permitted.

For Debian 8 "Jessie", this problem has been fixed in version
5.0.7-5+deb8u1.

We recommend that you upgrade your zsh 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