CVE-2026-102268

{
  "etk_id": "ETK-2026-1",
  "cve_id": "CVE-2026-102268",
  "display_id": "CVE-2026-102268",
  "ghsa_id": "GHSA-ffc3-869f-jxw9",
  "euvd_id": "EUVD-2026-88535",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Algorithm confusion in PyJWT PEM key validation",
  "summary": "PyJWT versions before 2.14.0 can accept forged HMAC-signed JWTs when an application mixes HMAC and asymmetric algorithms in its verification allow-list and passes certain noncanonical PEM public keys as raw key bytes. An attacker who knows the public verification key can impersonate token claims under that deployment configuration.",
  "mitigation": "Upgrade PyJWT to version 2.14.0 or later. Until upgraded, configure each verification path to allow only its intended algorithm family; do not mix HMAC and asymmetric algorithms.",
  "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": 9.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": 0.002,
  "epss_percentile": 0.0955,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 17.25130025,
  "t0_at": "2026-09-28T20:26:13.674000+00:00",
  "signals": {
    "check": {
      "at": "2026-09-29T20:02:37.101339+00:00",
      "days": 0.9836044830902778,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T20:26:13.674000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-10-02T13:12:13+00:00",
      "days": 3.6986033101851854,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T20:26:13.674000+00:00",
      "url": "https://github.com/covepseng/cve-2026-102268-poc"
    },
    "trigger_signal": {
      "at": "2026-09-28T20:26:13.674000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T20:26:13.674000+00:00",
      "url": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffc3-869f-jxw9"
    }
  }
}