CDATA Section Breakout via Unsanitised ]]> in xml_builder

{
  "id": "f592e8a3d6ee2d6ca7fb869b8049a59734d30eaed1860206e345a010af27dba3",
  "url": "https://osv.dev/vulnerability/CVE-2026-47080",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CDATA Section Breakout via Unsanitised ]]> in xml_builder",
    "summary": "XML Injection vulnerability in joshnuss xml_builder (XmlBuilder module) allows Content Spoofing, XML Injection. This vulnerability is associated with program files lib/xml_builder.ex and program routines XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.escape/1. The escape/1 clause for {:cdata, data} in lib/xml_builder.ex concatenates data verbatim between the CDATA opener without rewriting or splitting on the embedded ]]> sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]> and emit adjacent CDATA sections. An attacker who can supply input containing ]]> closes the CDATA section early; any bytes that follow are parsed as ordinary XML markup by downstream consumers, allowing injection of arbitrary elements, text, or entity references into the output document. This issue affects xml_builder: from 0.0.7 before 2.4.1.",
    "evidence": "osv:CVE-2026-47080",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-47080",
      "aliases": [
        "CVE-2026-47080",
        "EEF-CVE-2026-47080",
        "GHSA-67r9-hmxw-h595"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/joshnuss/xml_builder",
              "type": "GIT",
              "events": [
                {
                  "introduced": "26766f884ed19adee1563522c7afb5f056a6f3b5"
                },
                {
                  "fixed": "bfb1ada071ccc1e384c30f782197ca5154106706"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "26766f884ed19adee1563522c7afb5f056a6f3b5"
                      },
                      {
                        "fixed": "bfb1ada071ccc1e384c30f782197ca5154106706"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "bfb1ada071ccc1e384c30f782197ca5154106706"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47080.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.173512099Z",
      "provider": "osv",
      "references": [
        "https://cna.erlef.org/cves/CVE-2026-47080.html",
        "https://github.com",
        "https://osv.dev/vulnerability/EEF-CVE-2026-47080",
        "https://repo.hex.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47080.json",
        "https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-47080",
        "https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706",
        "https://github.com/joshnuss/xml_builder",
        "https://vincent.vulcoord.net/score/?state=Not+Scored&year=2026&year=2025&assigned_to=88bc49d9-8ddd-4227-affc-a613e67abc4d&ordering=-published&cve=CVE-2026-47080"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-91"
        ],
        "cna_assigner": "EEF",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0.0.7"
                  },
                  {
                    "fixed": "2.4.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47080.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-47080",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505768,
  "published_at": "2026-08-21T09:49:34.772+00:00"
}