I imagine it's a crime if you have a security clearance. But as far as I'm aware these guys never promised not to give away classified information.
Of course they can be pardoned, and they don't even need a pardon if the Justice Department decides not to prosecute. But just as a matter of idle curiosity, has any law actually be violated?
It does not matter what they promised, as it is against the law to give away classified information:
> Whoever knowingly and willfully communicates, furnishes, transmits, or otherwise makes available to an unauthorized person, or publishes, or uses in any manner prejudicial to the safety or interest of the United States or for the benefit of any foreign government to the detriment of the United States any classified information— […]
Any revelation of classified information to uncleared people violates the law; if DOGE staff were cleared it was illegal for them to reveal it, if they weren't it was illegal for them to be given access to it in the first place (which they must have had in order to reveal it).
Additionally, there are crimes for gathering and revealing sensitive national security information irrespective of having clearance, these are found in the Espionage Act. Julian Assange’s crime didn't involve him having clearance.