{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "loofah"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.25.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T22:01:58Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nLoofah\u0027s HTML5 sanitizer restricted only the `xlink:href` attribute on certain SVG elements to local, same-document references. Browsers also accept a plain `href` attribute as an alternative to the deprecated `xlink:href` per the SVG 2 spec, but Loofah did not apply the same restriction to it, allowing those elements to reference arbitrary external documents.\n\n## Impact\n\nSVG `\u003cuse\u003e` can load and render external SVG content by reference. If the referenced external SVG is same-origin and contains scripts or other dangerous content, it could execute in the context of the sanitized document. `\u003cfeImage\u003e` can load external images, which can be used for tracking. Modern browsers restrict cross-origin `\u003cuse\u003e` fetches, which limits but does not eliminate the risk.\n\nApplications that sanitize user-supplied SVG (directly, or as part of HTML) with Loofah\u0027s default allowlist are affected.\n\n## Mitigation\n\nUpgrade to Loofah \u003e= 2.25.2.\n\n## Credit\n\nFound by the maintainer, Mike Dalessio, during a security audit.",
  "id": "GHSA-9wjq-cp2p-hrgf",
  "modified": "2026-07-21T22:01:58Z",
  "published": "2026-07-21T22:01:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/flavorjones/loofah/security/advisories/GHSA-9wjq-cp2p-hrgf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/flavorjones/loofah"
    },
    {
      "type": "WEB",
      "url": "https://github.com/flavorjones/loofah/releases/tag/v2.25.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Loofah: SVG `href` attribute bypasses local-reference restriction"
}