CVE-2026-40070: Sgbett Bsv-Wallet

High severity, CVSS 8.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Sgbett Bsv-Wallet: from 0.1.2, before 0.3.4 (fixed in 0.3.4)
• Sgbett Bsv Ruby SDK: from 0.3.1, before 0.8.2 (fixed in 0.8.2)

Published 2026-04-09. Last modified 2026-06-17.