Vulnerability-Lookup

FKIE_CVE-2026-40070

Vulnerability from fkie_nvd - Published: 2026-04-09 18:17 - Updated: 2026-06-17 10:44

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Summary

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.

References

URL	Tags
security-advisories@github.com	https://brc.dev/52	Not Applicable
security-advisories@github.com	https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc	Release Notes
security-advisories@github.com	https://github.com/sgbett/bsv-ruby-sdk/issues/305	Issue Tracking
security-advisories@github.com	https://github.com/sgbett/bsv-ruby-sdk/pull/306	Issue Tracking
security-advisories@github.com	https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j	Exploit, Patch, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j	Exploit, Patch, Vendor Advisory

Impacted products

	Vendor	Product	Version
	sgbett	bsv-wallet	*
	sgbett	bsv_ruby_sdk	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "bsv-ruby-sdk",
          "vendor": "sgbett",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.3.1, \u003c 0.8.2"
            }
          ]
        },
        {
          "product": "bsv-sdk",
          "vendor": "sgbett",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.3.1, \u003c 0.8.2"
            }
          ]
        },
        {
          "product": "bsv-wallet",
          "vendor": "sgbett",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.1.2, \u003c 0.3.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:sgbett:bsv-wallet:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "64FDA9B4-4B7C-41B0-9736-991D19533DF6",
              "versionEndExcluding": "0.3.4",
              "versionStartIncluding": "0.1.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:sgbett:bsv_ruby_sdk:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "634CB7F0-563B-42FC-BCF4-3F222AA63921",
              "versionEndExcluding": "0.8.2",
              "versionStartIncluding": "0.3.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s signature over the certificate contents. In acquisition_protocol: \u0027direct\u0027, the caller supplies all certificate fields (including signature:) and the record is written to storage verbatim. In acquisition_protocol: \u0027issuance\u0027, 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."
    }
  ],
  "id": "CVE-2026-40070",
  "lastModified": "2026-06-17T10:44:41.090",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40070",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-13T15:29:59.716749Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-09T18:17:03.203",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Not Applicable"
      ],
      "url": "https://brc.dev/52"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/sgbett/bsv-ruby-sdk/issues/305"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/sgbett/bsv-ruby-sdk/pull/306"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

CVE-2026-40070 (GCVE-0-2026-40070)

Vulnerability from cvelistv5 – Published: 2026-04-09 17:26 – Updated: 2026-04-13 15:38

Title

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

Summary

Severity

8.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-13 15:29 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/sgbett/bsv-ruby-sdk/security/a…	x_refsource_CONFIRM
https://github.com/sgbett/bsv-ruby-sdk/issues/305	x_refsource_MISC
https://github.com/sgbett/bsv-ruby-sdk/pull/306	x_refsource_MISC
https://github.com/sgbett/bsv-ruby-sdk/commit/499…	x_refsource_MISC
https://brc.dev/52	x_refsource_MISC

Impacted products

3 products

Vendor	Product	Version
sgbett	bsv-ruby-sdk	Affected: >= 0.3.1, < 0.8.2
sgbett	bsv-sdk	Affected: >= 0.3.1, < 0.8.2
sgbett	bsv-wallet	Affected: >= 0.1.2, < 0.3.4

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40070",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-13T15:29:59.716749Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-13T15:38:58.154Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "bsv-ruby-sdk",
          "vendor": "sgbett",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.3.1, \u003c 0.8.2"
            }
          ]
        },
        {
          "product": "bsv-sdk",
          "vendor": "sgbett",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.3.1, \u003c 0.8.2"
            }
          ]
        },
        {
          "product": "bsv-wallet",
          "vendor": "sgbett",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.1.2, \u003c 0.3.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s signature over the certificate contents. In acquisition_protocol: \u0027direct\u0027, the caller supplies all certificate fields (including signature:) and the record is written to storage verbatim. In acquisition_protocol: \u0027issuance\u0027, 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": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347: Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-09T17:26:51.495Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sgbett/bsv-ruby-sdk/security/advisories/GHSA-hc36-c89j-5f4j"
        },
        {
          "name": "https://github.com/sgbett/bsv-ruby-sdk/issues/305",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sgbett/bsv-ruby-sdk/issues/305"
        },
        {
          "name": "https://github.com/sgbett/bsv-ruby-sdk/pull/306",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sgbett/bsv-ruby-sdk/pull/306"
        },
        {
          "name": "https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sgbett/bsv-ruby-sdk/commit/4992e8a265fd914a7eeb0405c69d1ff0122a84cc"
        },
        {
          "name": "https://brc.dev/52",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://brc.dev/52"
        }
      ],
      "source": {
        "advisory": "GHSA-hc36-c89j-5f4j",
        "discovery": "UNKNOWN"
      },
      "title": "bsv-sdk and bsv-wallet persist unverified certifier signatures in acquire_certificate (direct and issuance paths)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
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    "datePublished": "2026-04-09T17:26:51.495Z",
    "dateReserved": "2026-04-09T00:39:12.204Z",
    "dateUpdated": "2026-04-13T15:38:58.154Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.