Vulnerability · Published Jan 8, 2026 · Assigned by HeroDevs
CVE-2025-14505Elliptic Cryptanalysis vulnerability when `k` has leading zeros
Medium 5.6
In plain English
A medium-severity security flaw in Elliptic. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-elliptic | no fix listed | DEBIAN-CVE-2025-14505 |
| Debian:13 | node-elliptic | no fix listed | DEBIAN-CVE-2025-14505 |
| Debian:14 | node-elliptic | 6.6.1+dfsg+~6.4.18-2 | DEBIAN-CVE-2025-14505 |
| Ubuntu:22.04:LTS | node-elliptic | no fix listed | UBUNTU-CVE-2025-14505 |
| Ubuntu:24.04:LTS | node-elliptic | no fix listed | UBUNTU-CVE-2025-14505 |
| Ubuntu:25.10 | node-elliptic | no fix listed | UBUNTU-CVE-2025-14505 |
| Ubuntu:26.04:LTS | node-elliptic | no fix listed | UBUNTU-CVE-2025-14505 |
| Ubuntu:26.10 | node-elliptic | no fix listed | UBUNTU-CVE-2025-14505 |
| npm | elliptic | no fix listed | GHSA-848j-6mx2-7j84 |
Affected products (as reported)
Weakness: CWE-1240 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
References
- https://www.herodevs.com/vulnerability-directory/cve-2025-14505 third-party-advisory
- https://github.com/indutny/elliptic/issues/321 issue-tracking, exploit