Answer in brief
CVE-2026-56744 records a High severity (CVSS 8.7) vulnerability in `@bsv/wallet-toolbox` / `-client` / `-mobile` don't verify storage-supplied recipient output scripts against caller-requested outputs in createAction (can redirect payments when using remote storage). The current sources do not mark it as known exploited. The current feed maps bsv-blockchain/@bsv/wallet-toolbox (generic), bsv-blockchain/@bsv/wallet-toolbox-client (generic), bsv-blockchain/@bsv/wallet-toolbox-mobile (generic), @bsv/wallet-toolbox (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps bsv-blockchain/@bsv/wallet-toolbox (generic), bsv-blockchain/@bsv/wallet-toolbox-client (generic), bsv-blockchain/@bsv/wallet-toolbox-mobile (generic), @bsv/wallet-toolbox (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| bsv-blockchain/@bsv/wallet-toolboxgeneric | >=1.1.47 <2.4.0 | 2.4.0 |
| bsv-blockchain/@bsv/wallet-toolbox-clientgeneric | >=1.1.47 <2.4.0 | 2.4.0 |
| bsv-blockchain/@bsv/wallet-toolbox-mobilegeneric | >=1.3.21 <2.4.0 | 2.4.0 |
| @bsv/wallet-toolboxnpm | >=1.1.47,<2.4.0 | 2.4.0 |
| @bsv/wallet-toolbox-clientnpm | >=1.1.47,<2.4.0 | 2.4.0 |
| @bsv/wallet-toolbox-mobilenpm | >=1.3.21,<2.4.0 | 2.4.0 |
Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 25, 2026
`@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
Quoted source text, attributed separately from HOL analysis.