More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2375930 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Fix requires [1] which is non-trivial to backport. Realistically I won't be fixing this. [1] https://gitlab.freedesktop.org/poppler/poppler/-/merge_requests/1794