A memory leak means there's defective code that's not releasing resources it no longer needs. If you load windows task manager and see FFXIV is using stupid high amounts of RAM and then yes, there's likely a memory leak.
Even in Odin Limsa the most I've seen is 5 GB in use by ffxiv_dx11.exe and that's not uncommon.
Noon on a Monday in Odin Limsa at 4K maximum settings - this is what my ram usage for FFXIV looks like
This is completely normal RAM usage for an MMO and does not signal a "memory leak"
Memory corruption occurs when a memory location is unexpectedly modified, these are usually CPU level crashes.
Have you not noticed how most of the people complaining of crashes are using Intel CPU's, specifically 13 and 14 parts?
I haven't found a crash complaint thread from anyone using AMD.
First page alone has crash reports from someone using the following processors - 13700F, 13700K, 14700K.
The issues described by the OP are pointing towards possible CPU issues but ofc YMMV.
https://youtu.be/UmGsyuI1dYw?si=COI-xPHYMA9-FUOQ&t=82 - This is a good watch for anyone running an Intel 13 or 14 processor.
Are you on an Intel 13 or 14 processor by any chance?
Specifically 13600, 13700, 13900, 14600, 14700 or 14900 CPU's?
Another thread I found (
https://forum.square-enix.com/ffxiv/...fferent-errors.) having similar crashes.. "SYSTEM_CPU Intel Core i7 14700K"