{
  "cveId": "CVE-2026-48523",
  "url": "https://patchblox.com/security/cve/CVE-2026-48523",
  "summary": "CVE-2026-48523 is fixed in 3 products on 1 platform, first by python3-jwt 2.10.1-4ubuntu1.1, released May 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "pyjwt: PyJWT is a JSON Web Token implementation in Python",
  "description": "PyJWT is a JSON Web Token implementation in Python. From 2.9.0 to 2.12.1, there is a verifier-side algorithm allow-list bypass when jwt.decode() or jwt.decode_complete() are called with a PyJWK key. The token header alg is checked against the caller-supplied algorithms allow-list, but signature verification is performed with the algorithm bound to the PyJWK object instead of the header algorithm. An attacker who controls a registered JWK/JWKS private key can sign with a disallowed algorithm, advertise an allowed algorithm in the JWT header, and still be accepted. The issue affects the documented PyJWKClient.get_signing_key_from_jwt(...) flow. This vulnerability is fixed in 2.13.0.",
  "published": "2026-05-28T09:16:00Z",
  "severity": "medium",
  "cvss": 5.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
  "epss": 0.00127,
  "epssPercentile": 0.0236,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "pyjwt",
      "release": "Debian 14",
      "fixedVersion": "2.13.0-1",
      "fix": "DEBIAN-CVE-2026-48523",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-48523",
      "released": "2026-05-28T16:16:29Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "2.12.1-160000.2.1",
      "fix": "OPENSUSE-SU-2026:21095-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21095-1",
      "released": "2026-06-19T05:43:05Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "sles 15.6",
      "fixedVersion": "2.4.0-150200.3.14.1",
      "fix": "SUSE-SU-2026:2627-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2627-1",
      "released": "2026-06-25T08:13:14Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "sles 15.7",
      "fixedVersion": "2.4.0-150200.3.14.1",
      "fix": "SUSE-SU-2026:2627-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2627-1",
      "released": "2026-06-25T08:13:14Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "sles 16.0",
      "fixedVersion": "2.12.1-160000.2.1",
      "fix": "SUSE-SU-2026:22170-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22170-1",
      "released": "2026-06-19T05:44:26Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "2.10.1-4ubuntu1.1",
      "fix": "python3-jwt 2.10.1-4ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-python3-jwt-2.10.1-4ubuntu1.1",
      "released": "2026-05-28T09:16:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}