A deserialization of untrusted data vulnerability exists in rails < 5.2.4.3, rails < 6.0.3.1 which can allow an attacker to supply information can be inadvertently leaked fromStrong Parameters.
https://www.debian.org/security/2020/dsa-4766
https://lists.debian.org/debian-lts-announce/2020/07/msg00013.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00022.html
https://hackerone.com/reports/292797
https://groups.google.com/g/rubyonrails-security/c/f6ioe4sdpbY
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00107.html
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00093.html
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00089.html