{"id":"GHSA-p53j-g8pw-4w5f","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.","aliases":["CVE-2020-36843"],"modified":"2026-07-17T21:13:34.636587616Z","published":"2025-03-13T06:30:34Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2025-03-13T16:24:28Z","nvd_published_at":"2025-03-13T06:15:34Z","cwe_ids":["CWE-347"],"severity":"MODERATE"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36843"},{"type":"WEB","url":"https://github.com/str4d/ed25519-java/issues/82#issue-727629226"},{"type":"WEB","url":"https://github.com/i2p/i2p.i2p/commit/d7d1dcb5399c61cf2916ccc45aa25b0209c88712#diff-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb89a5a5c3"},{"type":"WEB","url":"https://eprint.iacr.org/2020/1244"},{"type":"PACKAGE","url":"https://github.com/str4d/ed25519-java"}],"affected":[{"package":{"name":"net.i2p.crypto:eddsa","ecosystem":"Maven","purl":"pkg:maven/net.i2p.crypto/eddsa"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.3.0"}]}],"versions":["0.1.0","0.2.0","0.3.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-p53j-g8pw-4w5f/GHSA-p53j-g8pw-4w5f.json"}},{"package":{"name":"net.i2p:i2p","ecosystem":"Maven","purl":"pkg:maven/net.i2p/i2p"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.39"}]}],"versions":["0.9.26","0.9.27","0.9.28","0.9.29","0.9.30","0.9.31","0.9.32","0.9.33","0.9.34","0.9.35","0.9.36","0.9.37","0.9.38"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-p53j-g8pw-4w5f/GHSA-p53j-g8pw-4w5f.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}]}