Searching for "index of / wallet.dat" is a common dorking technique used to find exposed Bitcoin Core
: These leaks usually happen when users backup their wallet data to a web-accessible directory without setting proper authentication or permissions . Best Practices for Protection indexofbitcoinwalletdat 2021
To avoid appearing in an "index of" search, users should follow strict "computer hygiene": Searching for "index of / wallet
If a user attempted to generate a massive number of addresses programmatically—specifically attempting to force the keypool to overflow or manipulate the internal indexing of the wallet.dat file—the software could behave unpredictably. The bug centered on the internal counters (indexes) used to track these keys. Under specific, rare conditions involving the JSON-RPC interface (the command-line tool used to interact with the node), the wallet could fail to properly flush these new keys to the disk ( wallet.dat ). indexofbitcoinwalletdat 2021