Inmate stabbed at Parklea prison

A prisoner has been stabbed at a Sydney prison on the same day NSW Corrections announced it had confiscated schematics that had been smuggled out by another inmate.

A 23-year-old inmate was allegedly assaulted by two other inmates at Parklea Correctional Centre on Wednesday morning, a NSW Corrective Services spokeswoman told AAP in a statement.

The injuries, which AAP understands are stab wounds, are not life-threatening.

The incident is being investigated by NSW Police and Corrective Services NSW.

No staff were injured in the incident.

The alleged attack comes as the department announced it had seized documents of a demountable building, which had been smuggled out by an inmate who had been housed at Parklea.

The architectural drawings were of a temporary building and had no detail in them that created a risk to security, the department said in a statement on Wednesday.

"These drawings are for an off-the-shelf demountable building, which will be temporarily located at Parklea to enable staff to monitor inmate movements," Corrective Services NSW Commissioner Peter Severin said.

Two inmates from Lithgow prison were also hospitalised on Wednesday after separate attacks.

A 28-year-old inmate remains in Westmead Hospital in a stable condition.

The incidents at Parklea are the latest in a series of scandals plaguing the privately run prison.

A 40-year-old female guard was nabbed at the prison on Sunday after allegedly supplying the drug to an inmate in exchange for cash, NSW Police said on Monday.

She was sacked and will appear in Blacktown Local Court on January 29 to face corruption charges.

A parliamentary inquiry was launched last month into Parklea jail following the widespread allegations of corruption and drug trafficking.

The inquiry comes after a video was published online in July showing an inmate at Parklea jail boasting about having a blade, the drug ice and a mobile phone.

The inmate, Carl Walton, at the time described the security arrangements at the privately run facility as "a dead-set joke" and alleged guards were involved in the mobile phone smuggling.

The video prompted a series of contraband stings in Parklea and other NSW prisons in recent months.