A rails security update has been released for Debian GNU/Linux 9 LT to address two security issues.

DLA 2655-1: rails security update

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Debian LTS Advisory DLA-2655-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
May 12, 2021   https://wiki.debian.org/LTS
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Package : rails
Version : 2:4.2.7.1-1+deb9u5
CVE ID : CVE-2021-22885 CVE-2021-22904
Debian Bug : 988214

CVE-2021-22885

There is a possible information disclosure/unintended method
execution vulnerability in Action Pack when using the
`redirect_to` or `polymorphic_url` helper with untrusted user
input.

CVE-2021-22904

There is a possible DoS vulnerability in the Token Authentication
logic in Action Controller. Impacted code uses
`authenticate_or_request_with_http_token` or
`authenticate_with_http_token` for request authentication.

For Debian 9 stretch, these problems have been fixed in version
2:4.2.7.1-1+deb9u5.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS