CVE-2026-47079

{"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 M\u00e4nnchen / 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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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.", "supportingMedia": [{"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.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-838", "description": "CWE-838 Inappropriate Encoding for Output Context"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "2.4.1", "versionStartIncluding": "0.0.6"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-08-21T09:52:44.178Z"}}}, "cveMetadata": {"cveId": "CVE-2026-47079", "state": "PUBLISHED", "dateUpdated": "2026-08-21T12:19:47.179Z", "dateReserved": "2026-05-18T17:28:10.319Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-08-21T09:52:44.178Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"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"}]}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "cveTags": [], "descriptions": [{"lang": "en", "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."}, {"lang": "es", "value": "Vulnerabilidad de codificaci\u00f3n inapropiada para el contexto de salida en joshnuss xml_builder (m\u00f3dulo XmlBuilder) permite la suplantaci\u00f3n de contenido (Content Spoofing), cross-site scripting.\n\nEsta vulnerabilidad est\u00e1 asociada con los archivos de programa lib/xml_builder.ex y las rutinas de programa XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.escape_string/1, XmlBuilder.escape_entity/1.\n\nXmlBuilder.generate/1 no escapa los caracteres literales & en texto o valores de atributos cuando van seguidos de un token similar a una entidad (lt;, gt;, amp;, quot;, apos;). Como resultado, la entrada proporcionada por el atacante, como <script>, se emite textualmente en el XML serializado en lugar de ser escapada a <script>. Cuando un analizador XML descendente lee el documento m\u00e1s tarde, decodifica las secuencias de entidades en los caracteres literales <script>, promoviendo texto de apariencia inerte a marcado real. Esto permite a un atacante eludir filtros ascendentes que bloquean los caracteres brutos < y >, inyectando marcado en cualquier consumidor descendente que analiza el XML producido y renderiza el contenido de texto en un contexto sensible al marcado (HTML, SVG, RSS/Atom feeds). Tanto el texto de los elementos como los valores de los atributos se ven afectados.\n\nEste problema afecta a xml_builder: desde 0.0.6 antes de 2.4.1."}], "id": "CVE-2026-47079", "lastModified": "2026-10-16T15:10:00.103", "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-2026-47079", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-21T12:17:52.012230Z", "version": "2.0.3"}}]}, "published": "2026-08-21T10:16:38.167", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-47079.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/joshnuss/xml_builder/commit/c3390e2046ec297b3bb8c30d5779cdfd6508c275"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/joshnuss/xml_builder/security/advisories/GHSA-5hjx-8g53-cmvm"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47079"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/joshnuss/xml_builder/security/advisories/GHSA-5hjx-8g53-cmvm"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-838"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.0.6,2.4.1)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "xml_builder", "source": "cna", "vendor": "joshnuss"}, "product": "xml_builder", "vendor": "joshnuss"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[aae31e6e8ac837bcbb8afb816c0d14324b5cfe2b,c3390e2046ec297b3bb8c30d5779cdfd6508c275)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "xml_builder", "source": "cna", "vendor": "joshnuss"}, "product": "xml_builder", "vendor": "joshnuss"}], "created": "2026-08-21T11:30:04.179118+00:00", "updated": "2026-08-21T12:45:03.939583+00:00", "vendors": ["joshnuss", "joshnuss$PRODUCT$xml_builder"]}