{"cve":"CVE-2020-36843","nvd":{"published":"2025-03-13T06:15:34.043","modified":"2026-06-17T03:16:18.577","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","score":4.3},"cwes":["CWE-347"],"references":["https://eprint.iacr.org/2020/1244","https://github.com/str4d/ed25519-java/issues/82#issue-727629226"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:00:17.429720821+00:00"},"epss":{"cve":"CVE-2020-36843","score":0.00143,"percentile":0.03605,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-p53j-g8pw-4w5f","url":"https://osv.dev/vulnerability/GHSA-p53j-g8pw-4w5f","summary":"Ed25519 Signature Malleability in ed25519-java Due to Missing Scalar Range Check","modified":"2026-09-10T03:49:48.504055684Z","packages":[{"ecosystem":"Maven","name":"net.i2p.crypto:eddsa","purl":"pkg:maven/net.i2p.crypto/eddsa","ranges":["<=0.3.0"],"fixed":[]},{"ecosystem":"Maven","name":"net.i2p:i2p","purl":"pkg:maven/net.i2p/i2p","ranges":["<0.9.39"],"fixed":["0.9.39"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}