DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode

{
  "id": "70dccaa7bb14a78df9e02b6e876c27baf89e86b96cc820b1da17c3b4d77a7138",
  "url": "https://osv.dev/vulnerability/CVE-2026-41239",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode",
    "summary": "DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Starting in version 1.0.10 and prior to version 3.4.0, `SAFE_FOR_TEMPLATES` strips `{{...}}` expressions from untrusted HTML. This works in string mode but not with `RETURN_DOM` or `RETURN_DOM_FRAGMENT`, allowing XSS via template-evaluating frameworks like Vue 2. Version 3.4.0 patches the issue.",
    "evidence": "osv:CVE-2026-41239",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-41239",
      "aliases": [
        "CVE-2026-41239",
        "GHSA-crv5-9vww-q3g8"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cure53/dompurify",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b537cab466329b1b077e0e5e3c14edad2b7142f7"
                },
                {
                  "fixed": "5b16e0b892e82b1779d62b9928b43c4c4ff290b9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.0.10"
                      },
                      {
                        "fixed": "3.4.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5b16e0b892e82b1779d62b9928b43c4c4ff290b9"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "3.4.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.3.3",
            "3.2.3",
            "3.1.3",
            "3.0.4",
            "2.4.3",
            "2.4.2",
            "2.4.1",
            "2.4.0",
            "2.3.12",
            "2.3.11",
            "2.3.10",
            "2.3.9",
            "2.3.8",
            "2.3.6",
            "2.3.5",
            "2.3.4",
            "2.3.3",
            "2.3.2",
            "2.3.1",
            "2.3.0",
            "2.2.9",
            "2.2.8",
            "2.2.7",
            "2.2.6",
            "2.2.4",
            "2.2.3",
            "2.2.2",
            "2.2.0",
            "2.1.1",
            "2.1.0",
            "2.0.17",
            "2.0.16",
            "2.0.15",
            "2.0.14",
            "2.0.13",
            "2.0.12",
            "2.0.11",
            "2.0.10",
            "2.0.9",
            "2.0.8",
            "2.0.6",
            "2.0.5",
            "2.0.4",
            "2.0.3",
            "2.0.2",
            "2.0.1",
            "2.0.0",
            "1.0.11",
            "1.0.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41239.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.402047743Z",
      "provider": "osv",
      "references": [
        "https://github.com/cure53/DOMPurify/releases/tag/3.4.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41239.json",
        "https://github.com/cure53/DOMPurify/security/advisories/GHSA-crv5-9vww-q3g8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-41239"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1289",
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41239.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-41239",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517956,
  "published_at": "2026-04-23T14:47:56.129+00:00"
}