Vulnerability in Sgbett Bsv-Ruby-Sdk
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (8.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- Sgbett Bsv-Ruby-Sdk — versions >= 0.3.1, < 0.8.2
- Sgbett Bsv Ruby Sdk
- Sgbett Bsv-Sdk — versions >= 0.3.1, < 0.8.2
- Sgbett Bsv-Wallet — versions >= 0.1.2, < 0.3.4
Weakness classification (CWE)
References
- github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j (Exploit, Patch, Vendor Advisory)
- github.com/sgbett/bsv-ruby-sdk/issues/305 (Issue Tracking)
- github.com/sgbett/bsv-ruby-sdk/pull/306 (Issue Tracking)
- github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc (Release Notes)
- brc.dev/52 (Not Applicable)
Frequently asked questions
- What is CVE-2026-40070?
- CVE-2026-40070 is a high-severity vulnerability in Sgbett Bsv-Ruby-Sdk, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.1/10. Published 2026-04-09.
- How severe is CVE-2026-40070?
- High severity. CVSS v3 base score is 8.1 out of 10.