A ruby-mechanize security update has been released for Debian GNU/Linux 9 LTS to address a command injection vulnerability.

DLA 2561-1: ruby-mechanize security update

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Debian LTS Advisory DLA-2561-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
February 17, 2021   https://wiki.debian.org/LTS
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Package : ruby-mechanize
Version : 2.7.5-1+deb9u1
CVE ID : CVE-2021-21289

Mechanize is an open-source Ruby library that makes automated web
interaction easy. In Mechanize, from v2.0.0 until v2.7.7, there
is a command injection vulnerability.

Affected versions of Mechanize allow for OS commands to be
injected using several classes' methods which implicitly use
Ruby's Kernel#open method.

For Debian 9 stretch, this problem has been fixed in version
2.7.5-1+deb9u1.

We recommend that you upgrade your ruby-mechanize packages.

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

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