CVE-2026-40070 | sgbett bsv-ruby-sdk/bsv-sdk/bsv-wallet prior 0.8.2 WalletClient signature verification

VDB-356644 · CVE-2026-40070 · GCVE-0-2026-40070 SGBETT BSV-RUBY-SDK/BSV-SDK/BSV-WALLET PRIOR 0.8.2 WALLETCLIENT SIGNATURE VERIFICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 1.28+ Summaryinfo A vulnerability categorized as critical has been discovered in sgbett bsv-ruby-sdk, bsv-sdk and bsv-wallet. This affects the function BSV::Wallet::WalletClient. Executing a manipulation can lead to signature verification. The identification of this vulnerability is CVE-2026-40070. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component. Detailsinfo A vulnerability classified as critical was found in sgbett bsv-ruby-sdk, bsv-sdk and bsv-wallet. This vulnerability affects the function BSV::Wallet::WalletClient. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes: 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. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-40070 since 04/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. Upgrading to version 0.8.2 eliminates this vulnerability. Productinfo Type Programming Language Software Vendor sgbett Name bsv-ruby-sdk bsv-sdk bsv-wallet Website Product: https://github.com/sgbett/bsv-ruby-sdk/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.2 VulDB Meta Temp Score: 7.0 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.1 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Signature verification CWE: CWE-347 / CWE-345 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: bsv-ruby-sdk/bsv-sdk/bsv-wallet 0.8.2 Timelineinfo 04/09/2026 Advisory disclosed 04/09/2026 +0 days CVE reserved 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-40070 (🔒) GCVE (CVE): GCVE-0-2026-40070 GCVE (VulDB): GCVE-100-356644 Entryinfo Created: 04/09/2026 19:59 Changes: 04/09/2026 19:59 (63) Complete: 🔍 Cache ID: 99:921:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸