CVE-2026-40070

HIGH EPSS 3.4%
Published Apr 9, 20262mo ago · Modified Jun 17, 20262w ago
8.1 CVSS 3.1
High
Find Similar
Published Apr 9, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
8.1
Exploitability
2.8
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
3.4% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-347

Affected Products 2

VendorProductVersionRange
sgbettbsv-wallet*≥0.1.2  –  <0.3.4
sgbettbsv_ruby_sdk*≥0.3.1  –  <0.8.2

References 5

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

Remediation

  • github.com https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j
    ExploitPatchVendor Advisory