{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40070","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-04-09T00:39:12.204Z","datePublished":"2026-04-09T17:26:51.495Z","dateUpdated":"2026-04-13T15:38:58.154Z"},"containers":{"cna":{"title":"bsv-sdk and bsv-wallet persist unverified certifier signatures in acquire_certificate (direct and issuance paths)","problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"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"}}],"references":[{"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/security/advisories/GHSA-hc36-c89j-5f4j"},{"name":"https://github.com/sgbett/bsv-ruby-sdk/issues/305","tags":["x_refsource_MISC"],"url":"https://github.com/sgbett/bsv-ruby-sdk/issues/305"},{"name":"https://github.com/sgbett/bsv-ruby-sdk/pull/306","tags":["x_refsource_MISC"],"url":"https://github.com/sgbett/bsv-ruby-sdk/pull/306"},{"name":"https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc","tags":["x_refsource_MISC"],"url":"https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc"},{"name":"https://brc.dev/52","tags":["x_refsource_MISC"],"url":"https://brc.dev/52"}],"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"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-09T17:26:51.495Z"},"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."}],"source":{"advisory":"GHSA-hc36-c89j-5f4j","discovery":"UNKNOWN"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-13T15:38:58.154Z"}}]}}