{
  "schema_version": "1.4.0",
  "id": "GHSA-p53j-g8pw-4w5f",
  "modified": "2025-03-13T16:24:28Z",
  "published": "2025-03-13T06:30:34Z",
  "aliases": [
    "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "net.i2p.crypto:eddsa"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.3.0"
            }
          ]
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "net.i2p:i2p"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.39"
            }
          ]
        }
      ]
    }
  ],
  "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"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-13T16:24:28Z",
    "nvd_published_at": "2025-03-13T06:15:34Z"
  }
}