This has also been noted by Assured AB when they did their security audit of the service [0].
> 3.4.1 Note Plaintext search queries in cache database
> Assured recommended hashing search terms before insertion / lookup in the cache database. Since search term cache lookups are only performed with exact matching, this should not affect functionality.
> Mullvad: We are now hashing (and salting) the search terms before they are added to Redis
> 3.4.1 Note Plaintext search queries in cache database
> Assured recommended hashing search terms before insertion / lookup in the cache database. Since search term cache lookups are only performed with exact matching, this should not affect functionality.
> Mullvad: We are now hashing (and salting) the search terms before they are added to Redis
[0] - https://mullvad.net/en/blog/2023/5/16/security-audit-of-our-...