[Bitcoin Core Warns of Wallet Migration Vulnerability in Versions 30.0 and 30.1] Bitcoin Core has issued a notice stating that versions 30.0 and 30.1 contain a critical vulnerability when migrating legacy BDB format wallets. In extremely rare cases, this may result in all wallet files on the node being mistakenly deleted, potentially leading to permanent loss of funds if no backup exists. This issue only affects the legacy wallet migration process and does not impact regular usage or existing wallets. The official team plans to fix the vulnerability in version 30.2 and advises users to avoid performing wallet migration operations before then.