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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://brc.dev/52	Not Applicable
https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc	Release Notes
https://github.com/sgbett/bsv-ruby-sdk/issues/305	Issue Tracking
https://github.com/sgbett/bsv-ruby-sdk/pull/306	Issue Tracking
https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j	Exploit Patch Vendor Advisory
https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j	Exploit Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:sgbett:bsv-wallet::::::ruby::*
	cpe:2.3:a:sgbett:bsv_ruby_sdk::::::ruby::*

History

No history.

Information

Published : 2026-04-09 18:17

Updated : 2026-06-17 10:44

NVD link : CVE-2026-40070

Mitre link : CVE-2026-40070

CVE.ORG link : CVE-2026-40070

JSON object : View

Products Affected

sgbett

bsv_ruby_sdk
bsv-wallet

CWE

CWE-347

Improper Verification of Cryptographic Signature

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