CVE-2026-47080 (GCVE-0-2026-47080)

Vulnerability from cvelistv5 – Published: 2026-08-21 09:49 – Updated: 2026-08-21 12:32
VLAI
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 <![CDATA[ and closer ]]> 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.
Severity
2.1 (Low)
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
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 12:30 UTC
CWE
  • CWE-91 - XML Injection (aka Blind XPath Injection)
Assigner
EEF CNA under the mitre root
CNA scorecard A 97/100 over 313 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
joshnuss xml_builder Affected: 0.0.7 , < 2.4.1 (semver)
    cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*
Create a notification for this product.
joshnuss xml_builder Affected: 26766f884ed19adee1563522c7afb5f056a6f3b5 , < bfb1ada071ccc1e384c30f782197ca5154106706 (git)
    cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Peter Ullrich Joshua Nussbaum Jonatan Männchen / EEF
Show details on NVD website
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                },
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                  "name": "\u0027Elixir.XmlBuilder\u0027:escape/1"
                }
              ],
              "repo": "https://github.com/joshnuss/xml_builder",
              "vendor": "joshnuss",
              "versions": [
                {
                  "lessThan": "2.4.1",
                  "status": "affected",
                  "version": "0.0.7",
                  "versionType": "semver"
                }
              ]
            },
            {
              "collectionURL": "https://github.com",
              "cpes": [
                "cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "modules": [
                "\u0027Elixir.XmlBuilder\u0027"
              ],
              "packageName": "joshnuss/xml_builder",
              "packageURL": "pkg:github/joshnuss/xml_builder",
              "product": "xml_builder",
              "programFiles": [
                "lib/xml_builder.ex"
              ],
              "programRoutines": [
                {
                  "name": "\u0027Elixir.XmlBuilder\u0027:generate/1"
                },
                {
                  "name": "\u0027Elixir.XmlBuilder\u0027:generate/2"
                },
                {
                  "name": "\u0027Elixir.XmlBuilder\u0027:escape/1"
                }
              ],
              "repo": "https://github.com/joshnuss/xml_builder",
              "vendor": "joshnuss",
              "versions": [
                {
                  "lessThan": "bfb1ada071ccc1e384c30f782197ca5154106706",
                  "status": "affected",
                  "version": "26766f884ed19adee1563522c7afb5f056a6f3b5",
                  "versionType": "git"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "2.4.1",
                      "versionStartIncluding": "0.0.7",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ],
              "operator": "AND"
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Peter Ullrich"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Joshua Nussbaum"
            },
            {
              "lang": "en",
              "type": "coordinator",
              "value": "Jonatan M\u00e4nnchen / EEF"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eXML Injection vulnerability in joshnuss xml_builder (\u003ccode\u003eXmlBuilder\u003c/code\u003e module) allows Content Spoofing, XML Injection.\u003c/p\u003e\n\u003cp\u003eThis vulnerability is associated with program files \u003ccode\u003elib/xml_builder.ex\u003c/code\u003e and program routines \u003ccode\u003eXmlBuilder.generate/1\u003c/code\u003e, \u003ccode\u003eXmlBuilder.generate/2\u003c/code\u003e, \u003ccode\u003eXmlBuilder.escape/1\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode\u003eescape/1\u003c/code\u003e clause for \u003ccode\u003e{:cdata, data}\u003c/code\u003e in \u003ccode\u003elib/xml_builder.ex\u003c/code\u003e concatenates data verbatim between the CDATA opener \u003ccode\u003e\u0026lt;![CDATA[\u003c/code\u003e and closer \u003ccode\u003e]]\u0026gt;\u003c/code\u003e without rewriting or splitting on the embedded \u003ccode\u003e]]\u0026gt;\u003c/code\u003e sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on \u003ccode\u003e]]\u0026gt;\u003c/code\u003e and emit adjacent CDATA sections. An attacker who can supply input containing \u003ccode\u003e]]\u0026gt;\u003c/code\u003e 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.\u003c/p\u003e\n\u003cp\u003eThis issue affects xml_builder: from 0.0.7 before 2.4.1.\u003c/p\u003e"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "XML Injection vulnerability in joshnuss xml_builder (`XmlBuilder` module) allows Content Spoofing, XML Injection.\n\nThis vulnerability is associated with program files `lib/xml_builder.ex` and program routines `XmlBuilder.generate/1`, `XmlBuilder.generate/2`, `XmlBuilder.escape/1`.\n\nThe `escape/1` clause for `{:cdata, data}` in `lib/xml_builder.ex` concatenates data verbatim between the CDATA opener `\u003c![CDATA[` and closer `]]\u003e` without rewriting or splitting on the embedded `]]\u003e` sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on `]]\u003e` and emit adjacent CDATA sections. An attacker who can supply input containing `]]\u003e` 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.\n\nThis issue affects xml_builder: from 0.0.7 before 2.4.1."
                }
              ],
              "value": "XML Injection vulnerability in joshnuss xml_builder (XmlBuilder module) allows Content Spoofing, XML Injection.\n\nThis vulnerability is associated with program files lib/xml_builder.ex and program routines XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.escape/1.\n\nThe escape/1 clause for {:cdata, data} in lib/xml_builder.ex concatenates data verbatim between the CDATA opener \u003c![CDATA[ and closer ]]\u003e without rewriting or splitting on the embedded ]]\u003e sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]\u003e and emit adjacent CDATA sections. An attacker who can supply input containing ]]\u003e 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.\n\nThis issue affects xml_builder: from 0.0.7 before 2.4.1."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-250",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-250 XML Injection"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "LOCAL",
                "baseScore": 2.1,
                "baseSeverity": "LOW",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "LOW",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "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",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-91",
                  "description": "CWE-91 XML Injection (aka Blind XPath Injection)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-21T09:49:34.772Z",
            "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
            "shortName": "EEF"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "related"
              ],
              "url": "https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://cna.erlef.org/cves/CVE-2026-47080.html"
            },
            {
              "tags": [
                "related"
              ],
              "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47080"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "CDATA Section Breakout via Unsanitised ]]\u003e in xml_builder"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "assignerShortName": "EEF",
        "cveId": "CVE-2026-47080",
        "datePublished": "2026-08-21T09:49:34.772Z",
        "dateReserved": "2026-05-18T17:28:10.319Z",
        "dateUpdated": "2026-08-21T12:32:15.846Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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