CVE-2026-106445

{
  "etk_id": "ETK-2026-804",
  "cve_id": "CVE-2026-106445",
  "display_id": "CVE-2026-106445",
  "ghsa_id": "GHSA-p8wg-vrv2-v86f",
  "euvd_id": "EUVD-2026-93952",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Prototype-access bypass enabling code execution in Handlebars",
  "summary": "Handlebars versions before 4.7.10 can allow a template to bypass restrictions on dangerous prototype properties. An attacker may execute JavaScript in the server process when they can control a rendered template, `allowProtoMethodsByDefault` is enabled, and the template context exposes a function.",
  "mitigation": "Upgrade the npm `handlebars` package to version 4.7.10 or later. Do not enable `allowProtoMethodsByDefault` when rendering untrusted templates or data.",
  "vendor": "handlebars-lang",
  "product": "handlebars.js",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.0.0, <= 4.7.9"
      ],
      "ecosystem": "npm",
      "fixed_versions": [],
      "package_name": "handlebars",
      "purl": "pkg:npm/handlebars"
    }
  ],
  "cwes": [
    184
  ],
  "cvss_score": 9.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0041,
  "epss_percentile": 0.34,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 12.828912866666666,
  "t0_at": "2026-10-06T19:39:08.916000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-07T04:34:07.961150+00:00",
      "days": 0.37151672627314813,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T19:39:08.916000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-10-10T08:24:22+00:00",
      "days": 3.531401435185185,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T19:39:08.916000+00:00",
      "url": "https://github.com/murrez/CVE-2026-106445"
    },
    "trigger_signal": {
      "at": "2026-10-05T22:40:33+00:00",
      "days": -0.8740268055555556,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T19:39:08.916000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-106445"
    }
  }
}