CVE-2026-40070

Name: CVE-2026-40070
Creator: NVD / NIST
Published: 2026-04-09T18:17:03.203+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.14%

Last modified Jun 17, 2026

CVE-2026-40070 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.14% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.14%

3.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Sgbett	Bsv-Wallet	>= 0.1.2, < 0.3.4
Sgbett	Bsv Ruby Sdk	>= 0.3.1, < 0.8.2

References

https://brc.dev/52Not Applicable
https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84ccRelease Notes
https://github.com/sgbett/bsv-ruby-sdk/issues/305Issue Tracking
https://github.com/sgbett/bsv-ruby-sdk/pull/306Issue Tracking
https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4jExploit, Patch, Vendor Advisory
https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4jExploit, Patch, Vendor Advisory

Timeline

Published: Apr 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40070?

How severe is CVE-2026-40070?

CVE-2026-40070 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.14% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40070?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40070?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST