CVE-2026-40070

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.

PUBLISHED Reserved 2026-04-09 | Published 2026-04-09 | Updated 2026-04-13 | Assigner GitHub_M

Problem types

CWE-347: Improper Verification of Cryptographic Signature

Product status

References

github.com/...by-sdk/security/advisories/GHSA-hc36-c89j-5f4j exploit

github.com/...by-sdk/security/advisories/GHSA-hc36-c89j-5f4j

github.com/sgbett/bsv-ruby-sdk/issues/305

github.com/sgbett/bsv-ruby-sdk/pull/306

github.com/...ommit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc

brc.dev/52

cve.org (CVE-2026-40070)

nvd.nist.gov (CVE-2026-40070)

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