{"id":"CVE-2026-40070","state":"PUBLISHED","title":"bsv-sdk and bsv-wallet persist unverified certifier signatures in acquire_certificate (direct and issuance paths)","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.","publishedAt":"2026-04-09T17:26:51.495Z","updatedAt":"2026-04-13T15:38:58.154Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["sgbett bsv-ruby-sdk","sgbett bsv-sdk","sgbett bsv-wallet"],"affected":[{"vendor":"sgbett","product":"bsv-ruby-sdk","versions":[{"version":">= 0.3.1, < 0.8.2","status":"affected"}]},{"vendor":"sgbett","product":"bsv-sdk","versions":[{"version":">= 0.3.1, < 0.8.2","status":"affected"}]},{"vendor":"sgbett","product":"bsv-wallet","versions":[{"version":">= 0.1.2, < 0.3.4","status":"affected"}]}],"references":["https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j","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/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc","https://brc.dev/52"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40070.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40070","state":"PUBLISHED","datePublished":"2026-04-09T17:26:51.495Z","dateUpdated":"2026-04-13T15:38:58.154Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-09T00:39:12.204Z"},"containers":{"cna":{"title":"bsv-sdk and bsv-wallet persist unverified certifier signatures in acquire_certificate (direct and issuance paths)","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"sgbett","product":"bsv-ruby-sdk","versions":[{"version":">= 0.3.1, < 0.8.2","status":"affected"}]},{"vendor":"sgbett","product":"bsv-sdk","versions":[{"version":">= 0.3.1, < 0.8.2","status":"affected"}]},{"vendor":"sgbett","product":"bsv-wallet","versions":[{"version":">= 0.1.2, < 0.3.4","status":"affected"}]}],"references":[{"url":"https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j","name":"https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/sgbett/bsv-ruby-sdk/issues/305","name":"https://github.com/sgbett/bsv-ruby-sdk/issues/305","tags":["x_refsource_MISC"]},{"url":"https://github.com/sgbett/bsv-ruby-sdk/pull/306","name":"https://github.com/sgbett/bsv-ruby-sdk/pull/306","tags":["x_refsource_MISC"]},{"url":"https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc","name":"https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc","tags":["x_refsource_MISC"]},{"url":"https://brc.dev/52","name":"https://brc.dev/52","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-09T17:26:51.495Z"},"source":{"advisory":"GHSA-hc36-c89j-5f4j","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-13T15:29:59.716749Z","id":"CVE-2026-40070","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-13T15:38:58.154Z"}}]}}}