Fedora has issued an advisory today (August 2): https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/IZZPVLNDMCZSENY2SD4VLV747BKZIQRX/ The issue is fixed upstream in 2.26.
pam_yubico-2.26-1.mga7 uploaded for Cauldron.
Version: Cauldron => 6
Mageia 6 is EOL.
Resolution: (none) => OLDStatus: NEW => RESOLVEDCC: (none) => mrambo