{
  "cveId": "CVE-2026-45363",
  "url": "https://patchblox.com/security/cve/CVE-2026-45363",
  "summary": "CVE-2026-45363 is fixed in ruby-jwt on 1 platform, first by DEBIAN-CVE-2026-45363, released July 19, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "ruby-jwt: ruby-jwt is a Ruby implementation of the RFC 7519 OAuth JSON Web Token standard",
  "description": "ruby-jwt is a Ruby implementation of the RFC 7519 OAuth JSON Web Token standard. Prior to 2.10.3 and 3.2.0, JWT.decode(token, \u0027\u0027, true, algorithm: \u0027HS256\u0027) accepts an attacker-forged token because OpenSSL::HMAC.digest(\u0027SHA256\u0027, \u0027\u0027, payload) returns a valid digest under an empty key and no empty-key precondition exists in the HMAC algorithm. The same path is reached when a keyfinder block or key_finder: argument returns an empty string, nil, or an array containing nil for an unknown key, affecting HS256, HS384, and HS512 verification through JWT.decode and JWT::EncodedToken#verify_signature!. This issue is fixed in versions 2.10.3 and 3.2.0.",
  "published": "2026-07-14T22:16:54Z",
  "severity": "critical",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00364,
  "epssPercentile": 0.305,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ruby-jwt",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.5.0-1\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-45363",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-45363",
      "released": "2026-07-19T12:50:38Z"
    },
    {
      "platform": "linux",
      "product": "ruby-jwt",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.7.1-1\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-45363",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-45363",
      "released": "2026-07-19T12:50:38Z"
    },
    {
      "platform": "linux",
      "product": "ruby-jwt",
      "release": "Debian 14",
      "fixedVersion": "3.2.0-1",
      "fix": "DEBIAN-CVE-2026-45363",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-45363",
      "released": "2026-07-19T12:50:38Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}