---
id: CVE-2026-56744
title: "`@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 stor…"
summary: "`@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 stor…"
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-1288
vendor: bsv-blockchain
product: '@bsv/wallet-toolbox'
affected:
  - '@bsv/wallet-toolbox >= 1.1.47, < 2.4.0'
  - '@bsv/wallet-toolbox-client >= 1.1.47, < 2.4.0'
  - '@bsv/wallet-toolbox-mobile >= 1.3.21, < 2.4.0'
patched:
  - '@bsv/wallet-toolbox 2.4.0'
  - '@bsv/wallet-toolbox-client 2.4.0'
  - '@bsv/wallet-toolbox-mobile 2.4.0'
published: '2026-09-24'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T19:57:08.043'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56744'
references:
  - url: >-
      https://github.com/bsv-blockchain/ts-stack/commit/3a11f6111919245a3090e9f3895cfc4f21a80d28
    label: security-advisories@github.com
  - url: >-
      https://github.com/bsv-blockchain/ts-stack/commit/5492cabbef4ddc7f60cc49cdf5d8c74ed2e5d949
    label: security-advisories@github.com
  - url: >-
      https://github.com/bsv-blockchain/ts-stack/commit/5ee60395e78e8b822d9a78efeacc6039c249819b
    label: security-advisories@github.com
  - url: >-
      https://github.com/bsv-blockchain/ts-stack/security/advisories/GHSA-36f9-7rg5-cpf8
    label: security-advisories@github.com
  - url: >-
      https://github.com/bsv-blockchain/wallet-toolbox/commit/ca651b067c0238cd8b1ddd3af225daa503857a07
    label: security-advisories@github.com
  - url: >-
      https://github.com/bsv-blockchain/ts-stack/security/advisories/GHSA-36f9-7rg5-cpf8
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56744'
  - url: 'https://github.com/advisories/GHSA-36f9-7rg5-cpf8'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - npm
epss: 0.00383
epssPercentile: 0.32166
aliases:
  - GHSA-36f9-7rg5-cpf8
ecosystem: npm
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-28T17:17:06.726403Z'
cvssSource: cna
ingestedAt: '2026-09-24T17:48:30.384Z'
---

## Overview

`@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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-56744)

Affected packages:

- `@bsv/wallet-toolbox >= 1.1.47, < 2.4.0`
- `@bsv/wallet-toolbox-client >= 1.1.47, < 2.4.0`
- `@bsv/wallet-toolbox-mobile >= 1.3.21, < 2.4.0`

Patched in:

- `@bsv/wallet-toolbox 2.4.0`
- `@bsv/wallet-toolbox-client 2.4.0`
- `@bsv/wallet-toolbox-mobile 2.4.0`

Source: https://github.com/advisories/GHSA-36f9-7rg5-cpf8