{"cve":"CVE-2026-40070","nvd":{"published":"2026-04-09T18:17:03.203","modified":"2026-10-26T21:10:00.170","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-347"],"references":["https://brc.dev/52","https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc","https://github.com/sgbett/bsv-ruby-sdk/issues/305","https://github.com/sgbett/bsv-ruby-sdk/pull/306","https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j"],"products":["sgbett:bsv-wallet","sgbett:bsv_ruby_sdk"],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-40070","score":0.00135,"percentile":0.02968,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-hc36-c89j-5f4j","url":"https://osv.dev/vulnerability/GHSA-hc36-c89j-5f4j","summary":"bsv-sdk and bsv-wallet persist unverified certifier signatures in acquire_certificate (direct and issuance paths)","modified":"2026-05-13T16:38:48.044722Z","packages":[{"ecosystem":"RubyGems","name":"bsv-sdk","purl":"pkg:gem/bsv-sdk","ranges":[">=0.3.1 <0.8.2"],"fixed":["0.8.2"]},{"ecosystem":"RubyGems","name":"bsv-wallet","purl":"pkg:gem/bsv-wallet","ranges":[">=0.1.2 <0.3.4"],"fixed":["0.3.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}