A rails security update has been released for Debian GNU/Linux 10 to address multiple security issues.

DSA 4929-1: rails security update

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Debian Security Advisory DSA-4929-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
June 09, 2021   https://www.debian.org/security/faq
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Package : rails
CVE ID : CVE-2021-22880 CVE-2021-22885 CVE-2021-22904
Debian Bug : 988214

Multiple security issues were discovered in the Rails web framework
which could result in denial of service.

For the stable distribution (buster), these problems have been fixed in
version 2:5.2.2.1+dfsg-1+deb10u3.

We recommend that you upgrade your rails packages.

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

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/