Elliptic Cryptanalysis vulnerability when `k` has leading zeros

{
  "id": "48f816ef99d2ffeb15c00c3d8ba959a2b4a9d50fd52336ed7a33d2fe947700a2",
  "url": "https://osv.dev/vulnerability/CVE-2025-14505",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Elliptic Cryptanalysis vulnerability when `k` has leading zeros",
    "summary": "The ECDSA implementation of the Elliptic package generates incorrect signatures if an interim value of 'k' (as computed based on step 3.2 of RFC 6979 https://datatracker.ietf.org/doc/html/rfc6979 ) has leading zeros and is susceptible to cryptanalysis, which can lead to secret key exposure. This happens, because the byte-length of 'k' is incorrectly computed, resulting in its getting truncated during the computation. Legitimate transactions or communications will be broken as a result. Furthermore, due to the nature of the fault, attackers could–under certain conditions–derive the secret key, if they could get their hands on both a faulty signature generated by a vulnerable version of Elliptic and a correct signature for the same inputs. This issue affects all known versions of Elliptic (at the time of writing, versions less than or equal to 6.6.1).",
    "evidence": "osv:CVE-2025-14505",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-14505",
      "aliases": [
        "CVE-2025-14505",
        "GHSA-848j-6mx2-7j84"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/indutny/elliptic",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "9b77436a59cc35eccf4ffb848259c8762a492ee7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "6.6.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.6.1",
            "v6.6.0",
            "v6.5.7",
            "v6.5.6",
            "v6.5.5",
            "v6.5.4",
            "v6.5.3",
            "v6.5.2",
            "v6.5.1",
            "v6.5.0",
            "v6.4.1",
            "v6.4.0",
            "v6.3.3",
            "v6.3.2",
            "v6.3.1",
            "v6.3.0",
            "v6.2.8",
            "v6.2.7",
            "v6.2.6",
            "v6.2.5",
            "v6.2.4",
            "v6.2.3",
            "v6.2.2",
            "v6.2.1",
            "v6.2.0",
            "v6.1.0",
            "v6.0.2",
            "v6.0.1",
            "v6.0.0",
            "v5.2.1",
            "v5.2.0",
            "v5.1.1",
            "v5.1.0",
            "v5.0.0",
            "v4.1.0",
            "v4.0.0",
            "v3.1.0",
            "v3.0.4",
            "v3.0.3",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0",
            "v1.0.1",
            "v1.0.0",
            "v0.16.0",
            "v0.15.17",
            "v0.15.16",
            "v0.15.15",
            "v0.15.14",
            "v0.15.13",
            "v0.15.12",
            "v0.15.11",
            "v0.15.10",
            "v0.15.9",
            "v0.15.8",
            "v0.15.7",
            "v0.15.6",
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            "v0.15.4",
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            "v0.14.2",
            "v0.14.1",
            "v0.14.0",
            "v0.13.2",
            "v0.13.1",
            "v0.13.0",
            "v0.12.0",
            "v0.11.1",
            "v0.11.0",
            "v0.10.2",
            "v0.10.1",
            "v0.10.0",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.0",
            "v0.7.0",
            "v0.6.1",
            "v0.6.0",
            "v0.5.0",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-14505.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.242028380Z",
      "provider": "osv",
      "references": [
        "https://registry.npmjs.org",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/14xxx/CVE-2025-14505.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-14505",
        "https://www.herodevs.com/vulnerability-directory/cve-2025-14505",
        "https://github.com/indutny/elliptic/issues/321",
        "https://github.com/indutny/elliptic"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1240"
        ],
        "cna_assigner": "HeroDevs",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/14xxx/CVE-2025-14505.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-14505",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488626,
  "published_at": "2026-01-08T21:05:14.8+00:00"
}