{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "jwt-simple"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2019-06-06T09:42:36Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Versions of `jwt-simple` prior to 0.5.3 are vulnerable to Signature Verification Bypass. If no algorithm is specified in the `decode()` function, the packages uses the algorithm in the JWT to decode tokens. This allows an attacker to create a HS256 (symmetric algorithm) JWT with the server\u0027s public key as secret, and the package will verify it as HS256 instead of RS256 (asymmetric algorithm).\n\n\n## Recommendation\n\nUpgrade to version 0.5.3 or later.",
  "id": "GHSA-8v5f-hp78-jgxq",
  "modified": "2020-08-31T18:37:26Z",
  "published": "2019-06-06T15:30:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hokaccha/node-jwt-simple/commit/ead36e1d687645da9c3be8befdaaef622ea33106"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/831"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Signature Verification Bypass in jwt-simple"
}