Credit default swaps are back in fashion — even if the panic might be overblown

Investors are getting nervous the U.S. government might struggle to pay its debt — and they are snapping up insurance in case it defaults.

The cost of insuring exposure to U.S. government debt has been rising steadily and is hovering near its highest level in two years, according to LSEG data.

Spreads or premiums on U.S. 1-year credit default swaps were up at 52 basis points as of Wednesday from 16 basis points at the start of this year, LSEG data showed.

Credit default swaps are like insurance for investors. Buyers pay a fee to protect themselves in case the borrower — in this case the U.S. government — can't repay their debt. When the cost of insuring the U.S. debt goes up, it's a sign that investors are getting nervous.

Spreads on the CDS with 5-year tenor were at nearly 50 basis points compared with about 30 basis points at the start of the year. In a CDS contract, the buyer pays a recurring premium known as the spread to the seller. If a borrower, in this case, the U.S. government defaults on its debt, the seller must compensate the buyer.