I don't see how a single absolute address could be exploitable based on my understanding of the threat model of this library. The library is in charge of erasin

I don't see how a single absolute address could be exploitable based on my understanding of the threat model of this library. The library is in charge of erasing the secrets from memory. Once the secrets have been erased from memory, what would an attacker gain from knowing an absolute address? The only thing that makes sense to me is a scenario with a lot of addresses. E.g. if there's an array of 256 integers, and those integers themselves aren't secret. Then there's a key composed of 32 of those integers, and the code picks which integers to use for the key by using pointers to them. If an attacker is able to know those 32 pointers, then the attacker can easily know what 32 integers the key is made of, and can thus know the key. Since the secret package doesn't erase pointers, it doesn't protect against this attack. The solution is to use 32 array indexes to choose the 32 integers, not 32 pointers to choose the 32 integers. The array indexes will be erased by the secret package.