Among the deals now being pulled are the most competitive two-year fixed products with an interest rate of less than 4%.
Barclays, HSBC, NatWest, Nationwide and Santander no longer offer sub-4% fixed deals, which were available last week.
Recent moves will be a particular blow for first-time buyers, according to Mary-Lou Press, president of NAEA Propertymark – the National Association of Estate Agents.
“This shift highlights how sensitive mortgage rates are to wider economic uncertainty, making it harder for people to plan and potentially slowing activity across the housing market,” she said.
“Even small increases in rates can significantly impact borrowing capacity and monthly costs, reinforcing the need for stability and confidence.”
Before the US-Israel war with Iran began, financial markets had expected UK interest rates to be cut this year.
But these expectations vanished after soaring oil prices raised the prospect of higher inflation.
The yield, or interest rate, on two-year government bonds – which indicates how much it would cost to borrow money for two years – has been volatile since the conflict began.
Jo Jingree, from advice firm Mortgage Confidence, encouraged borrowers to talk to their brokers.
“I’m speaking to many anxious clients at the moment who often come away from our conversations feeling less overwhelmed and much more reassured,” she said.
“Expert support is key. Mortgage advisers are in touch with lenders constantly and are surveying the changing rates on a daily basis.”