{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "2.25.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "2f31e7fae36036c9882d3d0fae720e1014c57cd1"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v2.25.3",
                "range": [
                  {
                    "fixed": "bbe007e52e8aeaa520b3e515235d467f5b1416e6"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "bbe007e52e8aeaa520b3e515235d467f5b1416e6"
            },
            {
              "fixed": "2f31e7fae36036c9882d3d0fae720e1014c57cd1"
            }
          ],
          "repo": "https://github.com/flavorjones/loofah",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-mf2j-8f84-cc9q"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1333",
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126205.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, the Loofah HTML5 sanitizer checks href and xlink:href on elements in SVG_ALLOW_LOCAL_HREF with a regular expression whose line anchor and newline-matching whitespace cause an all-whitespace value to be rescanned from every line start. An attacker can submit an SVG reference element with a long multiline-whitespace attribute and consume CPU quadratically during sanitization. CRuby 3.1 and earlier and JRuby are affected, while CRuby 3.2 and later uses linear-time regular-expression matching. The default safelist reaches the vulnerable check without a configuration change. This issue is fixed in version 2.25.3.",
  "id": "CVE-2026-126205",
  "modified": "2026-11-14T02:31:06.425723586Z",
  "published": "2026-11-12T20:41:25.574Z",
  "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-2026-126205.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/flavorjones/loofah/security/advisories/GHSA-mf2j-8f84-cc9q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126205"
    },
    {
      "type": "FIX",
      "url": "https://github.com/flavorjones/loofah/commit/2f31e7fae36036c9882d3d0fae720e1014c57cd1"
    },
    {
      "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:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Loofah: Regular expression denial of service in the SVG local-reference check"
}