{"id":"CVE-2020-36843","aliases":["GHSA-p53j-g8pw-4w5f"],"url":"https://o3.security/vulnerability/CVE-2020-36843","summary":"Ed25519 Signature Malleability in ed25519-java Due to Missing Scalar Range Check","details":"The implementation of EdDSA in EdDSA-Java (aka ed25519-java) through 0.3.0 exhibits signature malleability and does not satisfy the SUF-CMA (Strong Existential Unforgeability under Chosen Message Attacks) property. This allows attackers to create new valid signatures different from previous signatures for a known message.","published":"2025-03-13T06:15:34.043Z","modified":"2026-08-07T15:13:46.517285Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"},"epss":{"score":0.0014,"percentile":0.03759,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"net.i2p.crypto:eddsa","fixedVersion":null},{"ecosystem":"Maven","name":"net.i2p:i2p","fixedVersion":"0.9.39"}],"fix":{"url":"https://github.com/i2p/i2p.i2p/commit/d7d1dcb5399c61cf2916ccc45aa25b0209c88712#diff-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb89a5a5c3","label":"i2p/i2p.i2p@d7d1dcb"},"references":[{"type":"WEB","url":"https://eprint.iacr.org/2020/1244"},{"type":"REPORT","url":"https://github.com/str4d/ed25519-java/issues/82#issue-727629226"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36843"},{"type":"WEB","url":"https://github.com/i2p/i2p.i2p/commit/d7d1dcb5399c61cf2916ccc45aa25b0209c88712#diff-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb89a5a5c3"},{"type":"PACKAGE","url":"https://github.com/str4d/ed25519-java"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:13:46.517285Z"}}