CVE-2026-97031

{
  "etk_id": "ETK-2026-1997",
  "cve_id": "CVE-2026-97031",
  "display_id": "CVE-2026-97031",
  "ghsa_id": "GHSA-hq7w-2xrq-wp2j",
  "euvd_id": "EUVD-2026-95422",
  "status": "published",
  "anchor_state": "anchored",
  "title": "ECH parsing memory exhaustion in Go crypto/tls",
  "summary": "Go crypto/tls servers that process ECH ClientHello messages are affected by malformed inputs with multiple outer-extension references. A remote client able to reach such a server can cause excessive memory consumption and potentially disrupt the process.",
  "mitigation": "Upgrade Go crypto/tls to Go 1.26.9 or 1.27.2. Until upgraded, limit untrusted network access to TLS services that process ECH traffic.",
  "vendor": "Go standard library",
  "product": "crypto/tls",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 1.26.9",
        ">= 1.27.0-0, < 1.27.2"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "1.26.9",
        "1.27.2"
      ],
      "package_name": "crypto/tls",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": 0.0039,
  "epss_percentile": 0.3217,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 15.582149933333334,
  "t0_at": "2026-10-08T22:53:58.775000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-08T22:53:58.775000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-08T22:53:58.775000+00:00",
      "url": "https://github.com/advisories/GHSA-hq7w-2xrq-wp2j"
    }
  }
}