Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-08-21 09:49 – Updated: 2026-08-21 12:32

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 mitre root

References

5 references

URL	Tags
https://github.com/joshnuss/xml_builder/security/…	vendor-advisoryrelated
https://cna.erlef.org/cves/CVE-2026-47080.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-47080	related
https://github.com/joshnuss/xml_builder/commit/bf…	patch
https://vincent.vulcoord.net/score/?state=Not+Sco…	exploit

Impacted products

2 products

Vendor	Product	Version	CPE status
joshnuss	xml_builder	Affected: 0.0.7 , < 2.4.1 (semver) cpe:2.3:a:joshnuss:xml_builder::::::::
joshnuss	xml_builder	Affected: 26766f884ed19adee1563522c7afb5f056a6f3b5 , < bfb1ada071ccc1e384c30f782197ca5154106706 (git) cpe:2.3:a:joshnuss:xml_builder::::::::

Credits

Peter Ullrich Joshua Nussbaum Jonatan Männchen / EEF

Show details on NVD website

JSON

To clipboard

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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-47080\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-21T12:30:05.428465Z\"}}}], \"references\": [{\"url\": \"https://vincent.vulcoord.net/score/?state=Not+Scored\u0026year=2026\u0026year=2025\u0026assigned_to=88bc49d9-8ddd-4227-affc-a613e67abc4d\u0026ordering=-published\u0026cve=CVE-2026-47080\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-21T12:30:21.762Z\"}}], \"cna\": {\"title\": \"CDATA Section Breakout via Unsanitised ]]\u003e in xml_builder\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"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\"}], \"impacts\": [{\"capecId\": \"CAPEC-250\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-250 XML Injection\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 2.1, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"LOCAL\", \"baseSeverity\": \"LOW\", \"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\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/joshnuss/xml_builder\", \"vendor\": \"joshnuss\", \"modules\": [\"\u0027Elixir.XmlBuilder\u0027\"], \"product\": \"xml_builder\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.0.7\", \"lessThan\": \"2.4.1\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/xml_builder\", \"packageName\": \"xml_builder\", \"programFiles\": [\"lib/xml_builder.ex\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.XmlBuilder\u0027:generate/1\"}, {\"name\": \"\u0027Elixir.XmlBuilder\u0027:generate/2\"}, {\"name\": \"\u0027Elixir.XmlBuilder\u0027:escape/1\"}]}, {\"cpes\": [\"cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/joshnuss/xml_builder\", \"vendor\": \"joshnuss\", \"modules\": [\"\u0027Elixir.XmlBuilder\u0027\"], \"product\": \"xml_builder\", \"versions\": [{\"status\": \"affected\", \"version\": \"26766f884ed19adee1563522c7afb5f056a6f3b5\", \"lessThan\": \"bfb1ada071ccc1e384c30f782197ca5154106706\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/joshnuss/xml_builder\", \"packageName\": \"joshnuss/xml_builder\", \"programFiles\": [\"lib/xml_builder.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.XmlBuilder\u0027:generate/1\"}, {\"name\": \"\u0027Elixir.XmlBuilder\u0027:generate/2\"}, {\"name\": \"\u0027Elixir.XmlBuilder\u0027:escape/1\"}]}], \"references\": [{\"url\": \"https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-47080.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-47080\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706\", \"tags\": [\"patch\"]}], \"descriptions\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-91\", \"description\": \"CWE-91 XML Injection (aka Blind XPath Injection)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.4.1\", \"versionStartIncluding\": \"0.0.7\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-21T09:49:34.772Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-47080\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-21T12:32:15.846Z\", \"dateReserved\": \"2026-05-18T17:28:10.319Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-21T09:49:34.772Z\", \"assignerShortName\": \"EEF\"}",
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  }
}

FKIE_CVE-2026-47080

Vulnerability from fkie_nvd - Published: 2026-08-21 10:16 - Updated: 2026-08-21 13:18

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

Summary

References

	URL	Tags
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://cna.erlef.org/cves/CVE-2026-47080.html
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595
	6b3ad84c-e1a6-4bf7-a703-f496b71e49db	https://osv.dev/vulnerability/EEF-CVE-2026-47080
	134c704f-9b21-4f2e-91b3-4a467353bcc0	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

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "\u0027Elixir.XmlBuilder\u0027"
          ],
          "packageName": "xml_builder",
          "packageURL": "pkg:hex/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": "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"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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."
    }
  ],
  "id": "CVE-2026-47080",
  "lastModified": "2026-08-21T13:18:06.050",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 2.1,
          "baseSeverity": "LOW",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-47080",
          "options": [
            {
              "exploitation": "poc"
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            {
              "automatable": "no"
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            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-21T12:30:05.428465Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-21T10:16:38.497",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://cna.erlef.org/cves/CVE-2026-47080.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47080"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://vincent.vulcoord.net/score/?state=Not+Scored\u0026year=2026\u0026year=2025\u0026assigned_to=88bc49d9-8ddd-4227-affc-a613e67abc4d\u0026ordering=-published\u0026cve=CVE-2026-47080"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-91"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

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

FKIE_CVE-2026-47080

Tags

Sightings

Nomenclature