{
  "cveId": "CVE-2026-53550",
  "url": "https://patchblox.com/security/cve/CVE-2026-53550",
  "summary": "CVE-2026-53550 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-53550, released June 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "node-js-yaml: js-yaml is a JavaScript YAML parser and dumper",
  "description": "js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger algorithmic CPU exhaustion in js-yaml merge-key processing (\u003C\u003C) by repeating the same alias many times in a merge sequence. This causes quadratic parse-time behavior relative to input size and can block a Node.js worker/event loop for seconds with a relatively small payload (tens of KB), resulting in denial of service. The issue is in merge handling inside lib/loader.js. This vulnerability is fixed in 4.2.0 and 3.15.0.",
  "published": "2026-06-22T16:16:38Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
  "epss": 0.00415,
  "epssPercentile": 0.36107,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "agama-web-ui",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "17\u002B673.b97ba64d6-160000.12.1",
      "fix": "OPENSUSE-SU-2026:21448-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21448-1",
      "released": "2026-07-27T15:55:38Z"
    },
    {
      "platform": "linux",
      "product": "node-js-yaml",
      "release": "Debian 14",
      "fixedVersion": "4.2.0\u002B~4.0.9-1",
      "fix": "DEBIAN-CVE-2026-53550",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53550",
      "released": "2026-06-27T17:39:39Z"
    },
    {
      "platform": "linux",
      "product": "python-pytest-html",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "4.1.1-bp160.3.1",
      "fix": "OPENSUSE-SU-2026:21176-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21176-1",
      "released": "2026-06-30T07:49:32Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}