{
  "cveId": "CVE-2026-101918",
  "url": "https://patchblox.com/security/cve/CVE-2026-101918",
  "summary": "CVE-2026-101918 is fixed in 5 products on 1 platform, first by python3-jwt 2.10.1-4ubuntu1.3, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "PyJWT: Unauthenticated RecursionError DoS in pre-verification payload parse (PyJWKClient.get_signing_key_from_jwt / verify_signature=False)",
  "description": "PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.",
  "published": "2026-09-28T14:17:00Z",
  "severity": "Moderate",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Uncaught Exception",
  "epss": 0.00413,
  "epssPercentile": 0.35853,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-101918",
  "fixes": [
    {
      "platform": "linux",
      "product": "pyjwt",
      "release": "Debian 14",
      "fixedVersion": "2.15.0-1",
      "fix": "DEBIAN-CVE-2026-101918",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-101918",
      "released": "2026-10-04T21:29:23Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "2.12.1-160000.3.1",
      "fix": "OPENSUSE-SU-2026:22074-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22074-1",
      "released": "2026-11-07T00:47:19Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "sles 15.6",
      "fixedVersion": "2.8.0-150400.8.20.1",
      "fix": "SUSE-SU-2026:5064-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5064-1",
      "released": "2026-11-07T00:42:08Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "sles 15.7",
      "fixedVersion": "2.8.0-150400.8.20.1",
      "fix": "SUSE-SU-2026:5064-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5064-1",
      "released": "2026-11-07T00:42:08Z"
    },
    {
      "platform": "linux",
      "product": "python-PyJWT",
      "release": "sles 16.0",
      "fixedVersion": "2.12.1-160000.3.1",
      "fix": "SUSE-SU-2026:24219-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24219-1",
      "released": "2026-11-07T00:44:01Z"
    },
    {
      "platform": "linux",
      "product": "python-jwt",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.5.3\u002Bds1-1ubuntu0.1\u002Besm4",
      "fix": "python-jwt 1.5.3\u002Bds1-1ubuntu0.1\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-jwt-1.5.3-ds1-1ubuntu0.1-esm4",
      "released": "2026-10-27T21:14:57Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.5.3\u002Bds1-1ubuntu0.1\u002Besm4",
      "fix": "python3-jwt 1.5.3\u002Bds1-1ubuntu0.1\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-jwt-1.5.3-ds1-1ubuntu0.1-esm4",
      "released": "2026-10-27T21:14:57Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.7.1-2ubuntu2.1\u002Besm4",
      "fix": "python3-jwt 1.7.1-2ubuntu2.1\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-jwt-1.7.1-2ubuntu2.1-esm4",
      "released": "2026-10-27T21:15:02Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.3.0-1ubuntu0.6",
      "fix": "python3-jwt 2.3.0-1ubuntu0.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-python3-jwt-2.3.0-1ubuntu0.6",
      "released": "2026-10-27T21:15:05Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "2.7.0-1ubuntu0.4",
      "fix": "python3-jwt 2.7.0-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-jwt-2.7.0-1ubuntu0.4",
      "released": "2026-10-27T21:15:08Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "2.10.1-4ubuntu1.3",
      "fix": "python3-jwt 2.10.1-4ubuntu1.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-python3-jwt-2.10.1-4ubuntu1.3",
      "released": "2026-09-28T14:17:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "amzn 2023",
      "fixedVersion": "2.4.0-1.amzn2023.0.6",
      "fix": "ALAS2023-2026-3298",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3298",
      "released": "2026-11-07T01:06:07Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt\u002Bcrypto",
      "release": "amzn 2023",
      "fixedVersion": "2.4.0-1.amzn2023.0.6",
      "fix": "ALAS2023-2026-3298",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3298",
      "released": "2026-11-07T01:06:07Z"
    }
  ],
  "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"
  }
}