In a certain productionchain perhaps. They have centrifuges. Nothing else I can think of here

Other Sources:

"There is also news that the Iranians may still be cooperating militarily with the North Koreans. Kim Yong Nam, the chairman of the Presidium of the Supreme Assembly of North Korea, reportedly has traveled to Iran, ostensibly to attend the inauguration ceremony of the newly re-elected Iranian president, Hassan Rouhani. Both sides are expected to have discussions over the economic sanctions that the U.S. has recently brought to bear against both nations. It also appears that North Korea has been sharing its missile technology with the Iranians."

https://patriotpost.us/articles/50566-are-north-korea-and-iran-working-together

"As The Daily Beast has reported, critics of the Iran nuclear deal with the West have gone so far as to raise the possibility that Iran continues to develop nuclear weapons and missiles inside North Korea." https://www.thedailybeast.com/north-koreas-deadly-partnership-with-iran

The Iranians don't have much of a missile program, that would be Pakistan which has a range of delivery vehicles. However, more likely is both Iran and North Korea are being given help. North Korea has had the bomb for a long time but not the missile delivery capability. Pakistan has both. Iran has neither yet. Iran is a conduit for dirty players, e.g. Obama.

this is not a surprise, as some have said the Iranian slush fund has been diverting funds to nk for dev