md5 issues Postgres14 on OL7

Hi all,

we're currently facing a strange behavior with Postgres14.1 on Oracle Linux 7.9
using md5.

a basic statement leads to an out-of-memory error:

postgres=# select md5('just a test');
ERROR:  out of memory

Anyone else facing the same issue?
It may be related to hardening though disabling SELinux didn't solve the issue.

Thanks in advance,
Michael