CVE-2026-102946

{
  "etk_id": "ETK-2026-3058",
  "cve_id": "CVE-2026-102946",
  "display_id": "CVE-2026-102946",
  "ghsa_id": "GHSA-4pp3-559j-c5c2",
  "euvd_id": "EUVD-2026-102310",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Signature verification bypass in joserfc JWS JSON deserialization",
  "summary": "joserfc versions before 1.7.4 can treat a General JSON JWS with an empty signature list as authenticated when processed by `jws.deserialize_json()`. An unauthenticated attacker may cause a relying application to accept attacker-chosen content as genuine if the application processes untrusted General JSON JWS input through that API.",
  "mitigation": "Upgrade the `joserfc` package to version 1.7.4 or later. Until upgraded, reject General JSON JWS inputs whose signature list is empty before calling `jws.deserialize_json()`.",
  "vendor": "pip",
  "product": "joserfc",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "1.7.3"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "1.7.4"
      ],
      "package_name": "joserfc",
      "purl": "pkg:pypi/joserfc"
    }
  ],
  "cwes": [
    290
  ],
  "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": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 11.346519983333334,
  "t0_at": "2026-10-15T18:28:06.913000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-30T08:51:55.005527+00:00",
      "days": 14.599862182025463,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T18:28:06.913000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-09-09T07:21:56+00:00",
      "days": -36.46262630787037,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T18:28:06.913000+00:00",
      "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"
    },
    "trigger_signal": {
      "at": "2026-10-15T18:28:06.913000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T18:28:06.913000+00:00",
      "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"
    }
  }
}