{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "2.25.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "b198a36e44c9c5408163ac50787825e8ca0b166b"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v2.25.3",
                "range": [
                  {
                    "fixed": "bbe007e52e8aeaa520b3e515235d467f5b1416e6"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "bbe007e52e8aeaa520b3e515235d467f5b1416e6"
            },
            {
              "fixed": "b198a36e44c9c5408163ac50787825e8ca0b166b"
            }
          ],
          "repo": "https://github.com/flavorjones/loofah",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-m3x9-938q-5767"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-180",
      "CWE-184"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126207.json"
  },
  "details": "Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.3, Loofah::HTML5::Scrub.scrub_css checks only the first parse of a style attribute, then rebuilds CSS with identifier escapes decoded so escaped parentheses, property names, comments, or quotes can become a live url() without a second safety check. An attacker can use list-style to make a viewer's browser request an attacker-chosen URL when content renders, or cursor to make the request on hover. The request can disclose the viewer's IP address, user agent, access timing, and access to internal-network hosts, but no script survives sanitization and the attacker cannot read the response. This issue is fixed in version 2.25.3.",
  "id": "CVE-2026-126207",
  "modified": "2026-11-14T02:31:06.473827625Z",
  "published": "2026-11-12T20:53:55.553Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/flavorjones/loofah/releases/tag/v2.25.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126207.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/flavorjones/loofah/security/advisories/GHSA-m3x9-938q-5767"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126207"
    },
    {
      "type": "FIX",
      "url": "https://github.com/flavorjones/loofah/commit/b198a36e44c9c5408163ac50787825e8ca0b166b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/flavorjones/loofah/pull/324"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Loofah: CSS url() sanitization bypass via escaped parentheses"
}