A ruby2.5 security update has been released for Debian GNU/Linux 10 to address several vulnerabilities.

DSA 5066-1: ruby2.5 security update

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Debian Security Advisory DSA-5066-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 03, 2022   https://www.debian.org/security/faq
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Package : ruby2.5
CVE ID : CVE-2021-28965 CVE-2021-31799 CVE-2021-31810
CVE-2021-41817 CVE-2021-41819 CVE-2021-32066

Several vulnerabilities have been discovered in the interpreter for the
Ruby language and the Rubygems included, which may result on result in
XML roundtrip attacks, the execution of arbitrary code, information
disclosure, StartTLS stripping in IMAP or denial of service.

For the oldstable distribution (buster), these problems have been fixed
in version 2.5.5-3+deb10u4.

We recommend that you upgrade your ruby2.5 packages.

For the detailed security status of ruby2.5 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/ruby2.5

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/