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

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Summary

CVECVE-2026-40070
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-09 18:17:03 UTC
Updated2026-04-24 17:03:39 UTC
DescriptionBSV 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

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

EPSS: 0.000100000 probability, percentile 0.011350000 (date 2026-04-26)

Problem Types: CWE-347 | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Sgbett Bsv-wallet All All All All
Application Sgbett Bsv Ruby Sdk All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sgbett Bsv-ruby-sdk affected >= 0.3.1, < 0.8.2 Not specified
CNA Sgbett Bsv-sdk affected >= 0.3.1, < 0.8.2 Not specified
CNA Sgbett Bsv-wallet affected >= 0.1.2, < 0.3.4 Not specified

References

ReferenceSourceLinkTags
brc.dev/52 [email protected] brc.dev Not Applicable
github.com/sgbett/bsv-ruby-sdk/issues/305 [email protected] github.com Issue Tracking
github.com/sgbett/bsv-ruby-sdk/pull/306 [email protected] github.com Issue Tracking
github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff012... [email protected] github.com Release Notes
github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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