{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "xmldom \u003c= 0.6.0"
              },
              {
                "last_affected": "xmldom \u003c= 0.6.0"
              },
              {
                "introduced": "@xmldom/xmldom \u003c 0.8.12"
              },
              {
                "last_affected": "@xmldom/xmldom \u003c 0.8.12"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "c80a161172cc4d8733583bf0cf59abfa589f6d9e"
            },
            {
              "fixed": "2b852e836ab86dbbd6cbaf0537f584dd0b5ac184"
            },
            {
              "fixed": "189cb78a83e81e1515880988a399e863a8be85ac"
            },
            {
              "fixed": "7ffb16bce1170c7314151379531147637ab772a1"
            }
          ],
          "repo": "https://github.com/xmldom/xmldom",
          "type": "GIT"
        }
      ],
      "versions": [
        "@xmldom/xmldom \u003c 0.8.12",
        "xmldom \u003c= 0.6.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-wh4c-j3r5-mjhp"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-91"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34601.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "@xmldom/xmldom \u003e= 0.9.0, \u003c 0.9.9"
          },
          {
            "last_affected": "@xmldom/xmldom \u003e= 0.9.0, \u003c 0.9.9"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In xmldom versions 0.6.0 and prior and @xmldom/xmldom prior to versions 0.8.12 and 0.9.9, xmldom/xmldom allows attacker-controlled strings containing the CDATA terminator ]]\u003e to be inserted into a CDATASection node. During serialization, XMLSerializer emitted the CDATA content verbatim without rejecting or safely splitting the terminator. As a result, data intended to remain text-only became active XML markup in the serialized output, enabling XML structure injection and downstream business-logic manipulation. This issue has been patched in xmldom version 0.6.0 and @xmldom/xmldom versions 0.8.12 and 0.9.9.",
  "id": "CVE-2026-34601",
  "modified": "2026-07-23T03:56:10.751099337Z",
  "published": "2026-04-02T17:47:13.209Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.8.12"
    },
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.9.9"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34601.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-34601"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34601.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34601"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454595"
    },
    {
      "type": "FIX",
      "url": "https://github.com/xmldom/xmldom/commit/2b852e836ab86dbbd6cbaf0537f584dd0b5ac184"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "xmldom: XML injection via unsafe CDATA serialization allows attacker-controlled markup insertion"
}