{"id":"CVE-2025-14505","aliases":["GHSA-848j-6mx2-7j84"],"url":"https://o3.security/vulnerability/CVE-2025-14505","summary":"Elliptic Cryptanalysis vulnerability when `k` has leading zeros","details":"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.\n\nThis issue affects all known versions of Elliptic (at the time of writing, versions less than or equal to 6.6.1).","published":"2026-01-08T21:05:14.800Z","modified":"2026-07-15T01:48:58.795022184Z","cvss":{"score":5.6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"elliptic","fixedVersion":null}],"fix":null,"references":[{"type":"WEB","url":"https://registry.npmjs.org"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/14xxx/CVE-2025-14505.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-14505"},{"type":"ADVISORY","url":"https://www.herodevs.com/vulnerability-directory/cve-2025-14505"},{"type":"REPORT","url":"https://github.com/indutny/elliptic/issues/321"},{"type":"PACKAGE","url":"https://github.com/indutny/elliptic"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:48:58.795022184Z"}}