Debian (and probably other GNU/Linux distros, too) just released security updates for Ruby. They address the following vulnerabilities:
CVE-2021-41816
CVE-2021-41817
CVE-2021-41819
More about these CVEs: https://www.ruby-lang.org/en/security/

Does any of these affect Mastodon or GitLab?

#mastoadmin #gitlabadmin

Security

OK, the current GitLab version already uses Ruby 2.7.5, so it is not affected by these vulnerabilities.

#gitlabadmin

@chpietsch Nevertheless, GitLab released a security update for unknown reasons a few hours ago.