Any clients subscribed to the curben urlhaus-filter block list will either not be able to load or will see a warning when trying to load lists.ibiblio.org. We’re aware of the problem and investigating.
This appears to be entirely based on one reporter listing various attachments to the freetds list in the mailman archives: https://urlhaus.abuse.ch/browse.php?search=lists.ibiblio.org
Next step is to establish what urlhaus would accept as remediation and/or whether remediation is actually necessary.
The only URL in the list above that was reported as accessible has been made inaccessible. This should self-resolve after a re-scan.