Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sgbett | Bsv-Wallet | >= 0.1.2, < 0.3.4 |
| Sgbett | Bsv Ruby Sdk | >= 0.3.1, < 0.8.2 |
Related Weaknesses (CWE)
References
- https://brc.dev/52Not Applicable
- https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff012Release Notes
- https://github.com/sgbett/bsv-ruby-sdk/issues/305Issue Tracking
- https://github.com/sgbett/bsv-ruby-sdk/pull/306Issue Tracking
- https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4jExploitPatchVendor Advisory
- https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4jExploitPatchVendor Advisory
FAQ
What is CVE-2026-40070?
CVE-2026-40070 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-40070?
CVE-2026-40070 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40070?
Check the references section above for vendor advisories and patch information. Affected products include: Sgbett Bsv-Wallet, Sgbett Bsv Ruby Sdk.