CVE-2026-40070

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 98% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.1
EG Score
8.1(medium)
EPSS
3.4%
KEV
Not listed

Published

April 9, 2026

Last Modified

April 24, 2026

Advisory Details (5)

Auto-updated May 6, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

bsv-sdk and bsv-wallet persist unverified certifier signatures in acquire_certificate (direct and issuance paths) · Advisory · sgbett/bsv-ruby-sdk · GitHub

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

fix(security): A1 security hotfixes (bsv-sdk 0.8.2 + bsv-wallet 0.3.4) — closes #305 by sgbett · Pull Request #306 · sgbett/bsv-ruby-sdk · GitHub

https://github.com/sgbett/bsv-ruby-sdk/pull/306
generic

[HLR] A1 — Security hotfixes for bsv-sdk 0.8.2 + bsv-wallet 0.3.4 (post-compliance-review) · Issue #305 · sgbett/bsv-ruby-sdk · GitHub

https://github.com/sgbett/bsv-ruby-sdk/issues/305
generic🟡 PoC Available

Merge pull request #306 from sgbett/fix/305-security-hotfixes · sgbett/bsv-ruby-sdk@4992e8a · GitHub

https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc
generic

Identity Certificates | BRC

https://brc.dev/52

Affected Packages

(2 across 1 ecosystem)
RubyGems(2)
PackageVulnerable rangeFixed inDependents
bsv-sdk0.3.1 ... 0.8.1 (10 versions)0.8.2—
bsv-wallet0.1.2 ... 0.3.3 (8 versions)0.3.4—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-16 17:03 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
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  4. 2026-07-15 02:00 UTCEPSS rescore
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  9. 2026-07-11 08:27 UTCEPSS rescore
  10. 2026-07-09 19:10 UTCEPSS rescore
  11. 2026-07-08 15:15 UTCEPSS rescore
  12. 2026-07-07 13:46 UTCEPSS rescore
  13. 2026-07-06 16:27 UTCEPSS rescore
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  15. 2026-07-06 02:23 UTCEPSS rescore
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  22. 2026-06-28 14:07 UTCEPSS rescore
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  24. 2026-06-27 03:08 UTCEPSS rescore
  25. 2026-06-25 13:49 UTCEPSS rescore
Show 55 more
  1. 2026-06-25 13:49 UTCEPSS rescore
  2. 2026-06-24 14:05 UTCEPSS rescore
  3. 2026-06-23 21:33 UTCEPSS rescore
  4. 2026-06-22 14:25 UTCEPSS rescore
  5. 2026-06-22 14:25 UTCEPSS rescore
  6. 2026-06-21 14:56 UTCEPSS rescore
  7. 2026-06-21 14:56 UTCEPSS rescore
  8. 2026-06-19 19:25 UTCEPSS rescore
  9. 2026-06-18 17:52 UTCEPSS rescore
  10. 2026-06-18 17:52 UTCEPSS rescore
  11. 2026-06-17 17:53 UTCEPSS rescore
  12. 2026-06-16 17:52 UTCEPSS rescore
  13. 2026-06-15 17:49 UTCEPSS rescore
  14. 2026-06-13 23:00 UTCEPSS rescore
  15. 2026-06-12 23:12 UTCEPSS rescore
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  18. 2026-06-10 22:18 UTCEPSS rescore
  19. 2026-06-10 13:22 UTCEPSS rescore
  20. 2026-06-10 13:22 UTCEPSS rescore
  21. 2026-06-08 14:17 UTCEPSS rescore
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  23. 2026-06-07 15:25 UTCEPSS rescore
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  25. 2026-06-07 15:25 UTCEPSS rescore
  26. 2026-06-06 13:47 UTCEPSS rescore
  27. 2026-06-06 13:47 UTCEPSS rescore
  28. 2026-06-05 22:47 UTCEPSS rescore
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  30. 2026-06-04 13:12 UTCEPSS rescore
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  32. 2026-06-01 13:52 UTCEPSS rescore
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  35. 2026-05-31 22:30 UTCEPSS rescore
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  37. 2026-05-31 00:16 UTCEPSS rescore
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  40. 2026-05-29 13:44 UTCEPSS rescore
  41. 2026-05-29 13:44 UTCEPSS rescore
  42. 2026-05-28 13:44 UTCEPSS rescore
  43. 2026-05-28 13:44 UTCEPSS rescore
  44. 2026-05-28 13:44 UTCEPSS rescore
  45. 2026-05-27 13:40 UTCEPSS rescore
  46. 2026-05-27 13:40 UTCEPSS rescore
  47. 2026-05-27 13:40 UTCEPSS rescore
  48. 2026-05-26 13:44 UTCEPSS rescore
  49. 2026-05-26 07:18 UTCEPSS rescore
  50. 2026-05-26 07:18 UTCEPSS rescore
  51. 2026-05-20 22:38 UTCEPSS rescore
  52. 2026-05-20 22:38 UTCEPSS rescore
  53. 2026-05-20 18:04 UTCEG score recompute
  54. 2026-05-20 11:22 UTCEPSS rescore
  55. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40070?
CVE-2026-40070 is a high vulnerability published on April 9, 2026. BSV Ruby SDK is the Ruby SDK for the BSV blockchain. From 0.3.1 to before 0.8.2, BSV::Wallet::WalletClient#acquirecertificate persists certificate records to storage without verifying the certifier's signature over the certificate contents. In acquisitionprotocol: 'direct', the caller supplies all…
When was CVE-2026-40070 disclosed?
CVE-2026-40070 was first published in the National Vulnerability Database on April 9, 2026, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40070 actively exploited?
CVE-2026-40070 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40070?
CVE-2026-40070 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-40070?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40070, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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