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vuln-cve/data/2026/47xxx/CVE-2026-47079.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-47079",
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"state": "PUBLISHED",
"assignerShortName": "EEF",
"dateReserved": "2026-05-18T17:28:10.319Z",
"datePublished": "2026-08-21T09:52:44.178Z",
"dateUpdated": "2026-08-21T12:19:47.179Z"
},
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"'Elixir.XmlBuilder'"
],
"packageName": "xml_builder",
"packageURL": "pkg:hex/xml_builder",
"product": "xml_builder",
"programFiles": [
"lib/xml_builder.ex"
],
"programRoutines": [
{
"name": "'Elixir.XmlBuilder':generate/1"
},
{
"name": "'Elixir.XmlBuilder':generate/2"
},
{
"name": "'Elixir.XmlBuilder':escape_string/1"
},
{
"name": "'Elixir.XmlBuilder':escape_entity/1"
}
],
"repo": "https://github.com/joshnuss/xml_builder",
"vendor": "joshnuss",
"versions": [
{
"lessThan": "2.4.1",
"status": "affected",
"version": "0.0.6",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"'Elixir.XmlBuilder'"
],
"packageName": "joshnuss/xml_builder",
"packageURL": "pkg:github/joshnuss/xml_builder",
"product": "xml_builder",
"programFiles": [
"lib/xml_builder.ex"
],
"programRoutines": [
{
"name": "'Elixir.XmlBuilder':generate/1"
},
{
"name": "'Elixir.XmlBuilder':generate/2"
},
{
"name": "'Elixir.XmlBuilder':escape_string/1"
},
{
"name": "'Elixir.XmlBuilder':escape_entity/1"
}
],
"repo": "https://github.com/joshnuss/xml_builder",
"vendor": "joshnuss",
"versions": [
{
"lessThan": "c3390e2046ec297b3bb8c30d5779cdfd6508c275",
"status": "affected",
"version": "aae31e6e8ac837bcbb8afb816c0d14324b5cfe2b",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.4.1",
"versionStartIncluding": "0.0.6",
"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 Männchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "<p>Inappropriate Encoding for Output Context vulnerability in joshnuss xml_builder (<code>XmlBuilder</code> module) allows Content Spoofing, Cross-site Scripting.</p>\n<p>This vulnerability is associated with program files <code>lib/xml_builder.ex</code> and program routines <code>XmlBuilder.generate/1</code>, <code>XmlBuilder.generate/2</code>, <code>XmlBuilder.escape_string/1</code>, <code>XmlBuilder.escape_entity/1</code>.</p>\n<p><code>XmlBuilder.generate/1</code> does not escape literal <code>&amp;</code> characters in text or attribute values when they are followed by an entity-like token (<code>lt;</code>, <code>gt;</code>, <code>amp;</code>, <code>quot;</code>, <code>apos;</code>). As a result, attacker-supplied input such as <code>&amp;lt;script&amp;gt;</code> is emitted verbatim into the serialized XML rather than being escaped to <code>&amp;amp;lt;script&amp;amp;gt;</code>. When a downstream XML parser later reads the document, it decodes the entity sequences into the literal characters <code>&lt;script&gt;</code>, promoting inert-looking text into real markup. This allows an attacker to bypass upstream filters that block raw <code>&lt;</code> and <code>&gt;</code> characters, injecting markup into any downstream consumer that parses the produced XML and renders the text content in a markup-sensitive context (HTML, SVG, RSS/Atom feeds). Both element text and attribute values are affected.</p>\n<p>This issue affects xml_builder: from 0.0.6 before 2.4.1.</p>"
},
{
"base64": false,
"type": "text/markdown",
"value": "Inappropriate Encoding for Output Context vulnerability in joshnuss xml_builder (`XmlBuilder` module) allows Content Spoofing, Cross-site Scripting.\n\nThis vulnerability is associated with program files `lib/xml_builder.ex` and program routines `XmlBuilder.generate/1`, `XmlBuilder.generate/2`, `XmlBuilder.escape_string/1`, `XmlBuilder.escape_entity/1`.\n\n`XmlBuilder.generate/1` does not escape literal `&` characters in text or attribute values when they are followed by an entity-like token (`lt;`, `gt;`, `amp;`, `quot;`, `apos;`). As a result, attacker-supplied input such as `&lt;script&gt;` is emitted verbatim into the serialized XML rather than being escaped to `&amp;lt;script&amp;gt;`. When a downstream XML parser later reads the document, it decodes the entity sequences into the literal characters `<script>`, promoting inert-looking text into real markup. This allows an attacker to bypass upstream filters that block raw `<` and `>` characters, injecting markup into any downstream consumer that parses the produced XML and renders the text content in a markup-sensitive context (HTML, SVG, RSS/Atom feeds). Both element text and attribute values are affected.\n\nThis issue affects xml_builder: from 0.0.6 before 2.4.1."
}
],
"value": "Inappropriate Encoding for Output Context vulnerability in joshnuss xml_builder (XmlBuilder module) allows Content Spoofing, Cross-site Scripting.\n\nThis vulnerability is associated with program files lib/xml_builder.ex and program routines XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.escape_string/1, XmlBuilder.escape_entity/1.\n\nXmlBuilder.generate/1 does not escape literal & characters in text or attribute values when they are followed by an entity-like token (lt;, gt;, amp;, quot;, apos;). As a result, attacker-supplied input such as &lt;script&gt; is emitted verbatim into the serialized XML rather than being escaped to &amp;lt;script&amp;gt;. When a downstream XML parser later reads the document, it decodes the entity sequences into the literal characters <script>, promoting inert-looking text into real markup. This allows an attacker to bypass upstream filters that block raw < and > characters, injecting markup into any downstream consumer that parses the produced XML and renders the text content in a markup-sensitive context (HTML, SVG, RSS/Atom feeds). Both element text and attribute values are affected.\n\nThis issue affects xml_builder: from 0.0.6 before 2.4.1."
}
],
"impacts": [
{
"capecId": "CAPEC-120",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-120 Double Encoding"
}
]
}
],
"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-838",
"description": "CWE-838 Inappropriate Encoding for Output Context",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF",
"dateUpdated": "2026-08-21T09:52:44.178Z"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/joshnuss/xml_builder/security/advisories/GHSA-5hjx-8g53-cmvm"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-47079.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-47079"
},
{
"tags": [
"patch"
],
"url": "https://github.com/joshnuss/xml_builder/commit/c3390e2046ec297b3bb8c30d5779cdfd6508c275"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Round-trip Corruption via Improper Entity Escaping in xml_builder"
},
"adp": [
{
"references": [
{
"url": "https://github.com/joshnuss/xml_builder/security/advisories/GHSA-5hjx-8g53-cmvm",
"tags": [
"exploit"
]
}
],
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-08-21T12:17:52.012230Z",
"id": "CVE-2026-47079",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-08-21T12:19:47.179Z"
}
}
]
}
}
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