CVE-2026-82391

{
  "etk_id": "ETK-2026-4107",
  "cve_id": "CVE-2026-82391",
  "display_id": "CVE-2026-82391",
  "ghsa_id": "GHSA-8jrg-wx88-g75j",
  "euvd_id": "EUVD-2026-123035",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Out-of-bounds write in Zephyr HTTP/2 static file handling",
  "summary": "Zephyr HTTP server configurations using HTTP/2 with static filesystem resources can corrupt memory while serving a static file. An unauthenticated remote client can trigger a device crash or hang and may be able to alter control data. The affected configuration requires the HTTP/2 server front end and static filesystem support.",
  "mitigation": "Upgrade Zephyr to 4.3.2 or 4.5.0, as appropriate for the maintained release line. Until upgraded, disable HTTP/2 or remove static filesystem HTTP resources from exposed server configurations.",
  "vendor": "zephyrproject",
  "product": "zephyr",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.0.0, < 4.3.2"
      ],
      "ecosystem": "other",
      "fixed_versions": [
        "4.3.2"
      ],
      "package_name": "zephyr",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.4.0, < 4.5.0"
      ],
      "ecosystem": "other",
      "fixed_versions": [
        "4.5.0"
      ],
      "package_name": "zephyr",
      "purl": null
    }
  ],
  "cwes": [
    787
  ],
  "cvss_score": 9.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 40.968275033333335,
  "t0_at": "2026-11-10T22:07:39.047000+00:00",
  "signals": {
    "check": {
      "at": "2026-11-10T23:20:43.040642+00:00",
      "days": 0.05074066715277778,
      "is_lower_bound": false,
      "measured_at": "2026-11-10T22:07:39.047000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-11-10T22:07:39.047000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-10T22:07:39.047000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-82391"
    }
  }
}