CVE-2025-14505
Elliptic Cryptanalysis vulnerability when `k` has leading zeros
- State
- Published
- Severity
- 5.6 Medium
- Published
- Jan 8, 2026
- Updated
- Jan 8, 2026
- Reserved
- Dec 10, 2025
Description
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).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.6 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L | HeroDevs |
Weaknesses
- CWE-1240 Use of a Cryptographic Primitive with a Risky Implementation
Affected Products
| Product | Versions |
|---|---|
EllipticN/A |
|
References
- https://www.herodevs.com/vulnerability-directory/cve-2025-14505third-party-advisory
- https://github.com/indutny/elliptic/issues/321issue-trackingexploit
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