A zlib security update has been released for Debian GNU/Linux 8 LTS to address several issues including improper big-endian CRC calculation, improper left shift of negative integers and improper pointer arithmetic.

Package : zlib
Version : 1:1.2.8.dfsg-2+deb8u1
CVE ID : CVE-2016-9840 CVE-2016-9841 CVE-2016-9842 CVE-2016-9843

Several issues have been found in zlib, a compression library.
They are basically about improper big-endian CRC calculation, improper
left shift of negative integers and improper pointer arithmetic.

For Debian 8 "Jessie", these problems have been fixed in version
1:1.2.8.dfsg-2+deb8u1.

We recommend that you upgrade your zlib 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