A git security update has been released for both Debian GNU/Linux 9 and 10 to address an issue where the credential helper machinery can be fooled to return credential information for a wrong host.

DSA 4657-1: git security update

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Debian Security Advisory DSA-4657-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
April 14, 2020   https://www.debian.org/security/faq
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Package : git
CVE ID : CVE-2020-5260

Felix Wilhelm of Google Project Zero discovered a flaw in git, a fast,
scalable, distributed revision control system. With a crafted URL that
contains a newline, the credential helper machinery can be fooled to
return credential information for a wrong host.

For the oldstable distribution (stretch), this problem has been fixed
in version 1:2.11.0-3+deb9u6.

For the stable distribution (buster), this problem has been fixed in
version 1:2.20.1-2+deb10u2.

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/