CVE-2026-106104

{
  "etk_id": "ETK-2026-792",
  "cve_id": "CVE-2026-106104",
  "display_id": "CVE-2026-106104",
  "ghsa_id": "GHSA-68jq-fhch-4xq4",
  "euvd_id": "EUVD-2026-93569",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unauthenticated regex denial of service in Quasar SSR",
  "summary": "Quasar applications served with SSR are affected because browser detection processes unbounded User-Agent request headers using inefficient regular expressions. An unauthenticated remote attacker can send a crafted header that blocks the Node.js event loop and delays or denies service to other SSR requests. Client-only and other non-SSR Quasar targets are not affected.",
  "mitigation": "Upgrade the npm quasar package to version 2.23.3 or later. Until upgrades are complete, enforce a strict User-Agent header length limit at the edge or reverse proxy.",
  "vendor": "npm",
  "product": "quasar",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 2.23.2"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "2.23.3"
      ],
      "package_name": "quasar",
      "purl": "pkg:npm/quasar"
    }
  ],
  "cwes": [
    1333
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0029,
  "epss_percentile": 0.2042,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 18.444758066666665,
  "t0_at": "2026-10-06T17:14:45.817000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-07-28T16:04:30+00:00",
      "days": -70.04879417824074,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T17:14:45.817000+00:00",
      "url": "https://github.com/quasarframework/quasar/security/advisories/GHSA-68jq-fhch-4xq4"
    },
    "trigger_signal": {
      "at": "2026-10-06T17:14:45.817000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T17:14:45.817000+00:00",
      "url": "https://github.com/quasarframework/quasar/security/advisories/GHSA-68jq-fhch-4xq4"
    }
  }
}