CVE-2026-47080 (GCVE-0-2026-47080)
Vulnerability from cvelistv5 – Published: 2026-08-21 09:49 – Updated: 2026-08-21 12:32
VLAI
EPSS
VEX
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
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
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 | |
|---|---|---|---|
| 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:*:*:*:*:*:*:*:* |
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{
"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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