KDE has issued an advsiory today (February 9):
The issue is fixed upstream in 5.55 and in the commit linked from the advisory.
Mageia 6 is also affected.
KAuth allows to pass parameters with arbitrary types to helpers running as root
over DBus. Certain types can cause crashes and trigger decoding arbitrary
images with dynamically loaded plugins.
MGA6-32 MATE on IBM Thinkpad R50e
No installation issues
Found bug 20843 as previous update, but "Tested a wide variety of applications." is not really much info.
# urpmq --whatrequires kauth
So I installed kwallet and kwalletmanager5, but running this GUI with strace nor
$ strace -o kauth.txt kwallet-query -lv kauthtest
standby opening wallet "kauthtest"
org.kde.kwindowsystem: Could not find any platform plugin
testkauth (this is an item I created in the wallet)
created any usage of kauth apart from references to the messages.
Giving up, I don't want to run a full Plasma install on this old slow laptop.
It's used by any kde program that requires root authority to run.
Tested by selecting Tools/System Tools/KDE Partition Manager.
Advisory committed to svn. Validating the update.
An update for this issue has been pushed to the Mageia Updates repository.