Updated git packages has been released for both Debian GNU/Linux 8 LTS and 9:

DLA 1533-1: git security update
DSA 4311-1: git security update

DLA 1533-1: git security update

Package : git
Version : 1:2.1.4-2.1+deb8u7
CVE ID : CVE-2018-17456

joernchen of Phenoelit discovered that git, a fast, scalable,
distributed revision control system, is prone to an arbitrary code
execution vulnerability via a specially crafted .gitmodules file in a
project cloned with --recurse-submodules.

For Debian 8 "Jessie", this problem has been fixed in version
1:2.1.4-2.1+deb8u7.

We recommend that you upgrade your git 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

DSA 4311-1: git security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-4311-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
October 05, 2018 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : git
CVE ID : CVE-2018-17456

joernchen of Phenoelit discovered that git, a fast, scalable,
distributed revision control system, is prone to an arbitrary code
execution vulnerability via a specially crafted .gitmodules file in a
project cloned with --recurse-submodules.

For the stable distribution (stretch), this problem has been fixed in
version 1:2.11.0-3+deb9u4.

We recommend that you upgrade your git packages.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/