Context
This vulnerability has also been pointed out in #140
https://github.com/dogboy21/serializationisbad/blob/master/README.md
Around 2023, a vulnerability that allows for remote code execution was found in many 1.12 mods including /dank/null and EnderCore. This makes this modpack unsafe to play in multiplayer unless a patcher mod is added like SerializationIsBad.
EnderCore has an update that fixes the vulnerability but there has been no update for /dank/null so the only fix for that is to add a patcher.
The recommended fix for this is to add the SerializationIsBad mod to the pack.