CVE-2026-102273

{
  "etk_id": "ETK-2026-14",
  "cve_id": "CVE-2026-102273",
  "display_id": "CVE-2026-102273",
  "ghsa_id": "GHSA-w2cx-738m-mc7w",
  "euvd_id": "EUVD-2026-88541",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Algorithm-confusion token forgery in PyJWT HMAC key handling",
  "summary": "PyJWT 2.13.0 can mishandle public-key material stored in JWK container formats during HMAC JWT verification. An attacker with the public key may create tokens carrying attacker-chosen authenticated claims when the application mixes HMAC and asymmetric algorithms and reuses raw public JWK or JWKS data as an HMAC key.",
  "mitigation": "Upgrade PyJWT to version 2.14.0 or later. Keep symmetric and asymmetric verification flows separate, and do not use public JWK or JWKS data as an HMAC secret.",
  "vendor": "pip",
  "product": "pip:PyJWT",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "= 2.13.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "2.14.0"
      ],
      "package_name": "PyJWT",
      "purl": "pkg:pypi/PyJWT"
    }
  ],
  "cwes": [
    347
  ],
  "cvss_score": 7.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": 0.0018,
  "epss_percentile": 0.0655,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 11.581535066666667,
  "t0_at": "2026-09-28T20:38:28.161000+00:00",
  "signals": {
    "check": {
      "at": "2026-09-29T21:05:22.842607+00:00",
      "days": 1.018688444525463,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T20:38:28.161000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-09-28T20:38:28.161000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T20:38:28.161000+00:00",
      "url": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w2cx-738m-mc7w"
    }
  }
}