CVE-2026-56744

@bsv/wallet-toolbox provides BRC-100 wallet signing and storage components, while @bsv/wallet-toolbox-client and @bsv/wallet-toolbox-mobile provide client-focused distributions for standard and mobile applications using wallet storage services. A vulnerability in these packages causes transactions created through a remote StorageClient to trust output locking scripts returned by the storage provider without verifying that they match the outputs requested by the caller. A malicious or compromised storage provider can substitute a recipient script or inject an additional output, causing the wallet to sign and broadcast a transaction that redirects funds while the application and user interface continue to display the intended recipient. Source and npm publication history indicate that stable versions @bsv/wallet-toolbox and @bsv/wallet-toolbox-client from 1.1.47 through 2.3.3, and @bsv/wallet-toolbox-mobile from its initial 1.3.21 release through 2.3.3, are affected. All three packages are patched in version 2.4.0. Applications unable to upgrade should avoid remote StorageClient providers, use local storage, or independently verify every transaction output’s locking script and value against the original request before signing