CVE-2026-71971

{
  "etk_id": "ETK-2026-27",
  "cve_id": "CVE-2026-71971",
  "display_id": "CVE-2026-71971",
  "ghsa_id": "GHSA-9gg4-qrm6-f795",
  "euvd_id": "EUVD-2026-89429",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Out-of-bounds write in U-Boot IP fragment reassembly",
  "summary": "U-Boot versions before 2026.10-rc3 can write beyond a buffer while processing fragmented IP traffic when CONFIG_IP_DEFRAG is enabled. An attacker able to send network traffic to a netbooting device may corrupt bootloader memory and cause the device to crash.",
  "mitigation": "Upgrade U-Boot to 2026.10-rc3 or a later release. Disable CONFIG_IP_DEFRAG where fragmentation support is unnecessary, and limit netboot network access to trusted hosts.",
  "vendor": "u-boot",
  "product": "u-boot",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 2026.10-rc3"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "2026.10-rc3"
      ],
      "package_name": "u-boot",
      "purl": null
    }
  ],
  "cwes": [
    787
  ],
  "cvss_score": 8.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0038,
  "epss_percentile": 0.3003,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 119.15697441666667,
  "t0_at": "2026-09-29T21:29:20.055000+00:00",
  "signals": {
    "check": {
      "at": "2026-09-30T00:20:21.534510+00:00",
      "days": 0.11876712395833333,
      "is_lower_bound": false,
      "measured_at": "2026-09-29T21:29:20.055000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-09-29T21:29:20.055000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-29T21:29:20.055000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-71971"
    }
  }
}