CVE-2026-56744

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (20th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.7Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

@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

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
70
EG Risk 70/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 24, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit ca651b067c02 (bsv-blockchain/wallet-toolbox)

Fix landed in bsv-blockchain/wallet-toolbox commit ca651b067c02 — awaiting tagged release

https://github.com/bsv-blockchain/wallet-toolbox/commit/ca651b067c0238cd8b1ddd3af225daa503857a07
github_commit

commit 5ee60395e78e (bsv-blockchain/ts-stack)

Fix landed in bsv-blockchain/ts-stack commit 5ee60395e78e — awaiting tagged release

https://github.com/bsv-blockchain/ts-stack/commit/5ee60395e78e8b822d9a78efeacc6039c249819b
github_commit

commit 5492cabbef4d (bsv-blockchain/ts-stack)

Fix landed in bsv-blockchain/ts-stack commit 5492cabbef4d — awaiting tagged release

https://github.com/bsv-blockchain/ts-stack/commit/5492cabbef4ddc7f60cc49cdf5d8c74ed2e5d949
github_commit

commit 3a11f6111919 (bsv-blockchain/ts-stack)

Fix landed in bsv-blockchain/ts-stack commit 3a11f6111919 — awaiting tagged release

https://github.com/bsv-blockchain/ts-stack/commit/3a11f6111919245a3090e9f3895cfc4f21a80d28
github Patch Available🟡 PoC Available

Storage-supplied recipient output scripts are not verified against caller-requested outputs in createAction (can redirect payments when using remote storage) · Advisory · bsv-blockchain/ts-stack · GitHub

https://github.com/bsv-blockchain/ts-stack/security/advisories/GHSA-36f9-7rg5-cpf8

Vendor Advisories for CVE-2026-56744(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 1 ecosystem)
npm(3)
PackageVulnerable rangeFix by version rangeDependents
@bsv/wallet-toolbox—
  • 1.1.47 up to 2.4.0: fixed in 2.4.0
—
@bsv/wallet-toolbox-client—
  • 1.1.47 up to 2.4.0: fixed in 2.4.0
—
@bsv/wallet-toolbox-mobile—
  • 1.3.21 up to 2.4.0: fixed in 2.4.0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 24× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 01:38 UTCEG score recompute
  2. 2026-10-04 23:22 UTCEPSS rescore
  3. 2026-10-03 15:50 UTCEG score recompute
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-03 04:29 UTCEG score recompute
  6. 2026-10-02 17:56 UTCEPSS rescore
  7. 2026-10-02 05:56 UTCEG score recompute
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-09-30 16:36 UTCEG score recompute
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-29 16:55 UTCEG score recompute
  12. 2026-09-29 15:22 UTCEPSS rescore
  13. 2026-09-29 05:38 UTCEG score recompute
  14. 2026-09-28 18:22 UTCEG score recompute
  15. 2026-09-28 17:30 UTCEG score recompute
  16. 2026-09-28 13:51 UTCEPSS rescore
  17. 2026-09-28 00:41 UTCEG score recompute
  18. 2026-09-27 13:48 UTCEPSS rescore
  19. 2026-09-27 02:07 UTCEG score recompute
  20. 2026-09-26 15:59 UTCEPSS rescore
  21. 2026-09-26 03:33 UTCEG score recompute
  22. 2026-09-24 17:33 UTCEG score recompute
  23. 2026-09-24 17:02 UTCEG score recompute
  24. 2026-09-24 17:01 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56744?
CVE-2026-56744 is a high vulnerability published on September 24, 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…
When was CVE-2026-56744 disclosed?
CVE-2026-56744 was first published on September 24, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56744 actively exploited?
CVE-2026-56744 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56744?
CVE-2026-56744 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56744?
A fix for CVE-2026-56744 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56744 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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