{"id":"CVE-2020-13822","aliases":["GHSA-vh7m-p724-62c2"],"url":"https://o3.security/vulnerability/CVE-2020-13822","summary":"Signature Malleabillity in elliptic","details":"The Elliptic package 6.5.2 for Node.js allows ECDSA signature malleability via variations in encoding, leading '\\0' bytes, or integer overflows. This could conceivably have a security-relevant impact if an application relied on a single canonical signature.","published":"2020-06-04T15:15:13.510Z","modified":"2026-07-08T20:30:26.993039Z","cvss":{"score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},"epss":{"score":0.02629,"percentile":0.84772,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"elliptic","fixedVersion":"6.5.3"}],"fix":null,"references":[{"type":"WEB","url":"https://medium.com/%40herman_10687/malleability-attack-why-it-matters-7b5f59fb99a4"},{"type":"ADVISORY","url":"https://www.npmjs.com/package/elliptic"},{"type":"ADVISORY","url":"https://yondon.blog/2019/01/01/how-not-to-use-ecdsa/"},{"type":"EVIDENCE","url":"https://github.com/indutny/elliptic/issues/226"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T20:30:26.993039Z"}}