A git security update has been released for both Debian GNU/Linux 9 and 10 to address a flaw in git.

DSA 4659-1: git security update

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Debian Security Advisory DSA-4659-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
April 20, 2020 https://www.debian.org/security/faq
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Package : git
CVE ID : CVE-2020-11008

Carlo Arenas discovered a flaw in git, a fast, scalable, distributed
revision control system. With a crafted URL that contains a newline or
empty host, or lacks a scheme, the credential helper machinery can be
fooled into providing credential information that is not appropriate for
the protocol in use and host being contacted.

For the oldstable distribution (stretch), this problem has been fixed
in version 1:2.11.0-3+deb9u7.

For the stable distribution (buster), this problem has been fixed in
version 1:2.20.1-2+deb10u3.

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/