{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.4.0"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fa385f92440879601240020f158bed68e444e83a"
            }
          ],
          "repo": "https://github.com/digitalbazaar/forge",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-q67f-28xg-22rw"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33895.json"
  },
  "details": "Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, Ed25519 signature verification accepts forged non-canonical signatures where the scalar S is not reduced modulo the group order (`S \u003e= L`). A valid signature and its `S + L` variant both verify in forge, while Node.js `crypto.verify` (OpenSSL-backed) rejects the `S + L` variant, as defined by the specification. This class of signature malleability has been exploited in practice to bypass authentication and authorization logic (see CVE-2026-25793, CVE-2022-35961). Applications relying on signature uniqueness (i.e., dedup by signature bytes, replay tracking, signed-object canonicalization checks) may be bypassed. Version 1.4.0 patches the issue.",
  "id": "CVE-2026-33895",
  "modified": "2026-04-01T23:07:47.508104782Z",
  "published": "2026-03-27T20:47:54.492Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://datatracker.ietf.org/doc/html/rfc8032#section-8.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33895.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/digitalbazaar/forge/commit/bdecf11571c9f1a487cc0fe72fe78ff6dfa96b85"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/digitalbazaar/forge/security/advisories/GHSA-q67f-28xg-22rw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33895"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Forge has signature forgery in Ed25519 due to missing S \u003e L check"
}