Queensland's Crime and Corruption Commission (CCC) will investigate the leaking of confidential details of former premier Campbell Newman's defamation payout to Hannay Lawyers.

Earlier this month, it was reported taxpayers would foot a half-a-million-dollar settlement for comments made by Mr Newman and former attorney-general Jarrod Bleijie about two solicitors.

Mr Bleijie wrote to the CCC on May 19.

"My complaint concerns the possible breach of confidentiality that I allege has occurred in either in the premier's office or the attorney-general's office," Mr Bleijie told Parliament.

"The release of this government-held information jeopardises the ability of present and future ministers to carry out their role."

The CCC's Director of Integrity Services, Kylee Rumble, confirmed the investigation.

"The CCC's role is to assure that complaints involving suspected 'corruption' in Queensland's public sector agencies are dealt with appropriately," she said.

Attorney-General Yvette D'Ath did not comment and the Premier's office denied Mr Bleijie's allegation it could have been responsible for the leak.

Currently, ministers and former ministers are covered by the state for actions taken against them while carrying out their duties, Mr Bleijie told Parliament.

He said indemnity allowed politicians to publicly comment and be accountable to Parliament and the media.

"It is easy for someone not armed with the current correct facts to suggest a former minster should pay the money back," Mr Bleijie told Parliament.

"The present and future ministers of the ministry need to know they will have the necessary safeguards to protect their conduct and carry out their official duties."