Security Digest: April 9, 2026 - 2 Critical Vulnerabilities

Today's security briefing highlights two critical vulnerabilities: CVE-2026-40070 and CVE-2026-40069, affecting the BSV Ruby SDK and related packages. Immediate patching and verification are required to prevent certificate forgery and transaction integrity issues.

· 3 min read

Security Digest: April 9, 2026 - 2 Critical Vulnerabilities

Executive Summary

Today's security briefing highlights two critical vulnerabilities: CVE-2026-40070 and CVE-2026-40069, affecting the BSV Ruby SDK and related packages. Immediate patching and verification are required to prevent certificate forgery and transaction integrity issues.

Critical Vulnerabilities

CVE-2026-40070: Unverified Certificate Signatures

  • Impact: Allows attackers to forge identity certificates that appear legitimate.
  • Affected Systems: bsv-sdk >= 0.3.1, < 0.8.2 and bsv-wallet >= 0.1.2, < 0.3.4
  • Immediate Action: Upgrade to bsv-sdk >= 0.8.2 and/or bsv-wallet >= 0.3.4.
  • Mitigation: Until patched, do not use untrusted certifier endpoints and verify certificates out-of-band.

CVE-2026-40069: ARC Broadcaster Misinterpretation of Failure

  • Impact: Misleads applications into accepting failed transaction broadcasts as successful.
  • Affected Systems: bsv-sdk >= 0.1.0, < 0.8.2
  • Immediate Action: Upgrade to bsv-sdk >= 0.8.2.
  • Mitigation: Verify transaction broadcasts independently before proceeding with dependent actions.

What to Do Now

  1. Immediately upgrade affected packages to the patched versions.
  2. Verify all certificate-based operations and transaction broadcasts against trusted sources.
  3. Monitor for unusual activity in systems that utilize the affected SDK and adjust security policies accordingly.

Related Resources

  • Official Vendor Advisory for CVE-2026-40070 and CVE-2026-40069
  • Internal blog post: "Mitigating Risks from BSV SDK Vulnerabilities"

Keep reading