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CVE-2026-40070

Sgbett Bsv Ruby Sdk vulnerability

8.1 HIGHPublic exploitEPSS 0.20%
  1. Published9 Apr 2026

Description

BSV Ruby SDK is the Ruby SDK for the BSV blockchain. From 0.3.1 to before 0.8.2, BSV::Wallet::WalletClient#acquire_certificate persists certificate records to storage without verifying the certifier's signature over the certificate contents. In acquisition_protocol: 'direct', the caller supplies all certificate fields (including signature:) and the record is written to storage verbatim. In acquisition_protocol: 'issuance', the client POSTs to a certifier URL and writes whatever signature the response body contains, also without verification. An attacker who can reach either API (or who controls a certifier endpoint targeted by the issuance path) can forge identity certificates that subsequently appear authentic to list_certificates and prove_certificate.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Sgbett Bsv Ruby Sdk≥ 0.3.1 < 0.8.2
Sgbett Bsv-wallet≥ 0.1.2 < 0.3.4

Remediation

Fixed in
Sgbett Bsv Ruby Sdk≥ 0.8.2
Sgbett Bsv-wallet≥ 0.3.4

References

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Frequently asked

Is CVE-2026-40070 being actively exploited?

CVE-2026-40070 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.20%.

How severe is CVE-2026-40070?

CVE-2026-40070 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.20% probability of exploitation.

Which products are affected by CVE-2026-40070?

Affected products include Sgbett Bsv Ruby Sdk, Sgbett Bsv-wallet.

How do I fix CVE-2026-40070?

Upgrade affected software to a fixed version, for example Sgbett Bsv Ruby Sdk 0.8.2, Sgbett Bsv-wallet 0.3.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40070 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.