Tekashi 6ix9ine could be landing in a big pot of boiling water if convicted of violating parole … federal agents say the rainbow-haired rapper flagrantly had drugs and a gun inside his home, but he’s claiming he was framed!!!

On Monday, Tekashi apologized in open court for the trouble surrounding the March raid of his Florida home … an Assistant United States Attorney says a confidential source led them to retrieve MMDA, as well as a bag with cocaine residue, and a Glock handgun stashed inside the pool house.

Tekashi 6ix9ine tells TMZ … he believes the confidential informant in question could be a former friend who planted the drugs and gun. His lawyer, Lance Lazzaro, tells TMZ he’s confident they will be able to resolve the situation in a very favorable manner.

We broke the story back in March — feds rushed into 6ix9ine’s Florida mansion, flipping over furniture and even taking DNA samples.