Vulnerability in Sgbett Bsv-Ruby-Sdk
CVE-2026-40070
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.
EPSS: 0.001 (3.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: 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 — versions >= 0.3.1, < 0.8.2
- Sgbett Bsv_ruby_sdk
- Sgbett Bsv-sdk — versions >= 0.3.1, < 0.8.2
- Sgbett Bsv-wallet — versions >= 0.1.2, < 0.3.4
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Not Applicable)
Frequently asked questions
- What is CVE-2026-40070?
- CVE-2026-40070 is a high-severity vulnerability in Sgbett Bsv-Ruby-Sdk, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.1/10. Published 2026-04-09.
- How severe is CVE-2026-40070?
- High severity. CVSS v3 base score is 8.1 out of 10.