{
  "cveId": "CVE-2026-102273",
  "url": "https://patchblox.com/security/cve/CVE-2026-102273",
  "summary": "CVE-2026-102273 is fixed in 4 products on 1 platform, first by python3-jwt 2.10.1-4ubuntu1.2, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "PyJWT accepts public JWK containers as HMAC secrets",
  "description": "PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. This occurs when an application allows HMAC and asymmetric algorithms and passes a public JWK container as the raw key. As a result, public asymmetric key material is accepted as the HMAC secret. Consequently, an attacker who knows the public key can forge a token with arbitrary authenticated claims. This issue is fixed in version 2.14.0.",
  "published": "2026-09-28T14:17:00Z",
  "severity": "Important",
  "cvss": 7.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "cwe": "Improper Verification of Cryptographic Signature",
  "epss": 0.00175,
  "epssPercentile": 0.06983,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102273",
  "fixes": [
    {
      "platform": "linux",
      "product": "pyjwt",
      "release": "Debian 14",
      "fixedVersion": "2.14.0-1",
      "fix": "DEBIAN-CVE-2026-102273",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-102273",
      "released": "2026-10-04T21:29:23Z"
    },
    {
      "platform": "linux",
      "product": "python-jwt",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.5.3\u002Bds1-1ubuntu0.1\u002Besm3",
      "fix": "python-jwt 1.5.3\u002Bds1-1ubuntu0.1\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python-jwt-1.5.3-ds1-1ubuntu0.1-esm3",
      "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\u002Besm3",
      "fix": "python3-jwt 1.5.3\u002Bds1-1ubuntu0.1\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-python3-jwt-1.5.3-ds1-1ubuntu0.1-esm3",
      "released": "2026-10-27T21:14:57Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.7.1-2ubuntu2.1\u002Besm3",
      "fix": "python3-jwt 1.7.1-2ubuntu2.1\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-python3-jwt-1.7.1-2ubuntu2.1-esm3",
      "released": "2026-10-27T21:15:02Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.3.0-1ubuntu0.5",
      "fix": "python3-jwt 2.3.0-1ubuntu0.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-python3-jwt-2.3.0-1ubuntu0.5",
      "released": "2026-10-27T21:15:05Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "2.7.0-1ubuntu0.3",
      "fix": "python3-jwt 2.7.0-1ubuntu0.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-python3-jwt-2.7.0-1ubuntu0.3",
      "released": "2026-10-27T21:15:08Z"
    },
    {
      "platform": "linux",
      "product": "python3-jwt",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "2.10.1-4ubuntu1.2",
      "fix": "python3-jwt 2.10.1-4ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-python3-jwt-2.10.1-4ubuntu1.2",
      "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": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}