A ruby2.3 security update has been released for Debian GNU/Linux 9 LTS to address a cookie prefix spoofing vulnerability in CGI::Cookie.parse.

DLA 2853-1: ruby2.3 security update

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Debian LTS Advisory DLA-2853-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
December 27, 2021   https://wiki.debian.org/LTS
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Package : ruby2.3
Version : 2.3.3-1+deb9u11
CVE ID : CVE-2021-41817 CVE-2021-41819

A cookie prefix spoofing vulnerability in CGI::Cookie.parse and a
regular expression denial of service vulnerability (ReDoS) on date
parsing methods were discovered in src:ruby2.1, the Ruby interpreter.

For Debian 9 stretch, these problems have been fixed in version
2.3.3-1+deb9u11.

We recommend that you upgrade your ruby2.3 packages.

For the detailed security status of ruby2.3 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/ruby2.3

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