High 8.1Published Apr 9, 2026

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

Updated under an hour ago (Oct 26, 2026, 5:30 PM ET)

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It affects sgbett bsv-ruby-sdk and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for sgbett bsv-ruby-sdk

Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-347
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

sgbett bsv-ruby-sdk sgbett:bsv_ruby_sdk (from the name)	from 0.3.1, < 0.8.2	CNA record
sgbett bsv-sdk sgbett:bsv_sdk (from the name)	from 0.3.1, < 0.8.2	CNA record
sgbett bsv-wallet sgbett:bsv_wallet (from the name)	from 0.1.2, < 0.3.4	CNA record
sgbett bsv-wallet sgbett:bsv-wallet	from 0.1.2 before 0.3.4	NVD
sgbett bsv_ruby_sdk sgbett:bsv_ruby_sdk	from 0.3.1 before 0.8.2	NVD

References

References

https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j	x-refsource-confirm, exploit, patch, vendor-advisory
https://github.com/sgbett/bsv-ruby-sdk/issues/305	x-refsource-misc, issue-tracking
https://github.com/sgbett/bsv-ruby-sdk/pull/306	x-refsource-misc, issue-tracking
https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc	x-refsource-misc, release-notes
https://brc.dev/52	x-refsource-misc, not-applicable

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.