A ruby-rack-cors security update has been released for Debian GNU/Linux 10 to address an improper pathname handling.

DSA 4918-1: ruby-rack-cors security update

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Debian Security Advisory DSA-4918-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
May 18, 2021   https://www.debian.org/security/faq
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Package : ruby-rack-cors
CVE ID : CVE-2019-18978
Debian Bug : 944849

Improper pathname handling in ruby-rack-cors, a middleware that makes
Rack-based apps CORS compatible, may result in access to private
resources.

For the stable distribution (buster), this problem has been fixed in
version 1.0.2-1+deb10u1.

We recommend that you upgrade your ruby-rack-cors packages.

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

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/