The abrupt rise in interest rates is already putting pressure on the profitability of many banks by causing losses in the securities portfolios of some institutes, the regulator said in the report.

"Another sudden and sharp rise in interest rates would put some institutions under severe strain," it added.

"For many smaller banks, hidden reserves as a first line of defence are now depleted," BaFin president Mark Branson said upon presenting the report. "We are now prioritising capital planning for institutions with little excess capital and high interest rate risks."

(Reporting by Marta Orosz, Writing by Rachel More; editing by Matthias Williams)