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CVE-2026-40070— bsv-sdk and bsv-wallet persist unverified certifier signatures in acquire_certificate (direct and issuance paths)

CVSS 8.1 · High EPSS 0.01% · P1
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I. Basic Information for CVE-2026-40070

Vulnerability Information
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Vulnerability Title
bsv-sdk and bsv-wallet persist unverified certifier signatures in acquire_certificate (direct and issuance paths)
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
BSV Ruby SDK 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BSV Ruby SDK是Simon Bettison个人开发者的一个BSV区块链的Ruby开发工具包。 BSV Ruby SDK 0.3.1至0.8.2之前版本存在数据伪造问题漏洞，该漏洞源于存储证书记录时未验证签名，可能导致攻击者伪造身份证书。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
sgbettbsv-ruby-sdk >= 0.3.1, < 0.8.2 -
sgbettbsv-sdk >= 0.3.1, < 0.8.2 -
sgbettbsv-wallet >= 0.1.2, < 0.3.4 -

II. Public POCs for CVE-2026-40070

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9079 chars
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III. Intelligence Information for CVE-2026-40070

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IV. Related Vulnerabilities

Same product: bsv-ruby-sdk
Same vendor: sgbett
Same weakness: CWE-347

V. Comments for CVE-2026-40070

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