CVE-2026-103636

{
  "etk_id": "ETK-2026-2167",
  "cve_id": "CVE-2026-103636",
  "display_id": "CVE-2026-103636",
  "ghsa_id": "GHSA-9935-w26g-xf2m",
  "euvd_id": "EUVD-2026-96309",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Out-of-bounds read in DataSketches C++ VarOpt union deserialization",
  "summary": "Apache DataSketches C++ versions 2.0.0-incubating through 5.2.0 can read beyond supplied input while decoding malformed VarOpt union data. An attacker able to provide such serialized data to an application may cause a crash or disclose adjacent process memory.",
  "mitigation": "Upgrade apache/datasketches-cpp to version 5.3.0 or later. Until upgraded, do not deserialize VarOpt union data from untrusted sources.",
  "vendor": "Apache Software Foundation",
  "product": "Apache DataSketches",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.0.0-incubating, <= 5.2.0"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "apache/datasketches-cpp",
      "purl": null
    }
  ],
  "cwes": [
    125
  ],
  "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": 0.0052,
  "epss_percentile": 0.4331,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 15.6096275,
  "t0_at": "2026-10-10T10:23:58.547000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-10T10:23:58.547000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-10T10:23:58.547000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-103636"
    }
  }
}