CVE-2026-73552

{
  "etk_id": "ETK-2026-771",
  "cve_id": "CVE-2026-73552",
  "display_id": "CVE-2026-73552",
  "ghsa_id": "GHSA-23xh-2qxr-3xv8",
  "euvd_id": "EUVD-2026-84104",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Envoy RBAC safe-regex authorization bypass",
  "summary": "Envoy HTTP RBAC can incorrectly allow requests when safe_regex evaluates accepted non-UTF-8 request-header data under negative or inverted authorization logic. An unauthenticated remote client needs a deployment that accepts such header bytes and has a protected path whose routing or policy handling still recognizes the relevant header content.",
  "mitigation": "Upgrade Envoy to 1.39.1, 1.38.4, 1.37.6, 1.36.10 or later.",
  "vendor": "envoy proxy",
  "product": "envoy proxy:Envoy",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<1.40.0"
      ],
      "ecosystem": "envoy proxy",
      "fixed_versions": [
        "1.39.1",
        "1.38.4",
        "1.37.6",
        "1.36.10"
      ],
      "package_name": "Envoy",
      "purl": null
    }
  ],
  "cwes": [
    20
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
  "epss_score": 0.0047,
  "epss_percentile": 0.3963,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 15.962121816666667,
  "t0_at": "2026-09-21T19:37:20.546000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-06T14:01:53.358600+00:00",
      "days": 14.76704644212963,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T19:37:20.546000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-08-26T14:03:13+00:00",
      "days": -26.232031782407407,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T19:37:20.546000+00:00",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-23xh-2qxr-3xv8"
    },
    "trigger_signal": {
      "at": "2026-09-21T19:37:20.546000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-21T19:37:20.546000+00:00",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-23xh-2qxr-3xv8"
    }
  }
}