Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 0.9%
CVSS Severity
CVSS v3 Score 8.1
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
- https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j
Products affected by CVE-2026-40070
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cpe:2.3:a:sgbett:bsv-wallet:0.1.2
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cpe:2.3:a:sgbett:bsv-wallet:0.2.0
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cpe:2.3:a:sgbett:bsv-wallet:0.2.1
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cpe:2.3:a:sgbett:bsv-wallet:0.2.2
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cpe:2.3:a:sgbett:bsv-wallet:0.3.0
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cpe:2.3:a:sgbett:bsv-wallet:0.3.1
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cpe:2.3:a:sgbett:bsv-wallet:0.3.2
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cpe:2.3:a:sgbett:bsv-wallet:0.3.3
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.3.1
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.3.2
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.4.0
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.5.0
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.6.0
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.6.1
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.6.2
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.7.0
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.8.0
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cpe:2.3:a:sgbett:bsv_ruby_sdk:0.8.1