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[ CVE-2026-56744 · Published 24 Sep 2026 ]

`@bsv/wallet-toolbox` / `-client` / `-mobile` don't verify storage-supplied recipient output scripts against caller-requested outputs in createAction

CVSS 8.7 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

`@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

[ Fixes ]Fixes and patches

  • @bsv/wallet-toolbox 2.4.0Fixed version · GitHub Advisories · npm package @bsv/wallet-toolbox: upgrade to 2.4.0 or later (affected >= 1.1.47, < 2.4.0)
  • @bsv/wallet-toolbox-client 2.4.0Fixed version · GitHub Advisories · npm package @bsv/wallet-toolbox-client: upgrade to 2.4.0 or later (affected >= 1.1.47, < 2.4.0)
  • @bsv/wallet-toolbox-mobile 2.4.0Fixed version · GitHub Advisories · npm package @bsv/wallet-toolbox-mobile: upgrade to 2.4.0 or later (affected >= 1.3.21, < 2.4.0)

[ Packages ]Affected open-source packages

  • @bsv/wallet-toolbox npmAffected >= 1.1.47, < 2.4.0 · fixed in 2.4.0 · GHSA-36f9-7rg5-cpf8
  • @bsv/wallet-toolbox-client npmAffected >= 1.1.47, < 2.4.0 · fixed in 2.4.0 · GHSA-36f9-7rg5-cpf8
  • @bsv/wallet-toolbox-mobile npmAffected >= 1.3.21, < 2.4.0 · fixed in 2.4.0 · GHSA-36f9-7rg5-cpf8

[ References ]References