ETK-2026-4316Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-4316",
  "cve_id": null,
  "display_id": "ETK-2026-4316",
  "ghsa_id": "GHSA-mhc9-xvg5-qg29",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Unsigned token acceptance in LibJWT verification",
  "summary": "LibJWT versions 3.0.0 through 3.6.1 may accept attacker-created unsigned JWS tokens under vulnerable keyring or verification-callback configurations. An attacker can bypass token authentication and supply arbitrary claims when the application does not restrict verification algorithms and uses an affected configuration.",
  "mitigation": "Upgrade LibJWT to version 3.6.2. Until upgraded, allowlist expected algorithms with `jwt_checker_setalgs()` where supported, reject callback key-lookup failures, and configure an explicit expected algorithm rather than `JWT_ALG_NONE`.",
  "vendor": "other",
  "product": "other:LibJWT",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.0.0, <= 3.6.1"
      ],
      "ecosystem": "other",
      "fixed_versions": [
        "3.6.2"
      ],
      "package_name": "LibJWT",
      "purl": null
    }
  ],
  "cwes": [
    287
  ],
  "cvss_score": 9.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 9.8102901,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-11-12T19:46:10+00:00",
      "days": -0.19493994318287036,
      "is_lower_bound": true,
      "measured_at": "2026-11-13T00:26:53.032393+00:00",
      "url": "https://github.com/benmcollins/libjwt/security/advisories/GHSA-mhc9-xvg5-qg29"
    },
    "trigger_signal": {
      "at": "2026-11-12T19:46:10+00:00",
      "days": -0.19493994318287036,
      "is_lower_bound": true,
      "measured_at": "2026-11-13T00:26:53.032393+00:00",
      "url": "https://github.com/benmcollins/libjwt/security/advisories/GHSA-mhc9-xvg5-qg29"
    }
  }
}