CVE-2026-123274

{
  "etk_id": "ETK-2026-4375",
  "cve_id": "CVE-2026-123274",
  "display_id": "CVE-2026-123274",
  "ghsa_id": "GHSA-v92m-x8fp-25xm",
  "euvd_id": "EUVD-2026-125275",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Out-of-bounds write in Apache DataSketches C++",
  "summary": "Apache DataSketches C++ 2.0.0 through 5.3.0 is affected when an application deserializes KLL sketches from untrusted sources. An attacker able to supply a malformed serialized sketch may corrupt heap memory through invalid level-boundary handling.",
  "mitigation": "Upgrade Apache DataSketches C++ to version 5.3.1. Until upgrading, do not deserialize KLL sketch data from untrusted sources.",
  "vendor": "Apache Software Foundation",
  "product": "Apache DataSketches C++",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.0.0-incubating, <= 5.3.0"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "apache/datasketches-cpp",
      "purl": null
    }
  ],
  "cwes": [
    787
  ],
  "cvss_score": null,
  "cvss_src": null,
  "cvss_vector": null,
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 9.76475535,
  "t0_at": "2026-11-13T10:34:29.123000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-13T10:34:29.123000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T10:34:29.123000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-123274"
    }
  }
}