A curl security update has been released for both Debian GNU/Linux 9 and 10 to address multiple vulnerabilities in cURL.

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Debian Security Advisory DSA-4633-1 security@debian.org
  https://www.debian.org/security/ Alessandro Ghedini
February 22, 2020   https://www.debian.org/security/faq
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Package : curl
CVE ID : CVE-2019-5436 CVE-2019-5481 CVE-2019-5482
Debian Bug : 929351 940009 940010

Multiple vulnerabilities were discovered in cURL, an URL transfer
library.

CVE-2019-5436

A heap buffer overflow in the TFTP receiving code was discovered,
which could allow DoS or arbitrary code execution. This only affects
the oldstable distribution (stretch).

CVE-2019-5481

Thomas Vegas discovered a double-free in the FTP-KRB code, triggered
by a malicious server sending a very large data block.

CVE-2019-5482

Thomas Vegas discovered a heap buffer overflow that could be
triggered when a small non-default TFTP blocksize is used.

For the oldstable distribution (stretch), these problems have been fixed
in version 7.52.1-5+deb9u10.

For the stable distribution (buster), these problems have been fixed in
version 7.64.0-4+deb10u1.

We recommend that you upgrade your curl packages.

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

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/