{"api_version":"1","generated_at":"2026-09-16T00:36:53+00:00","cve":"CVE-2026-47079","urls":{"html":"https://cve.report/CVE-2026-47079","api":"https://cve.report/api/cve/CVE-2026-47079.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-47079","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-47079"},"summary":{"title":"Round-trip Corruption via Improper Entity Escaping in xml_builder","description":"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;). 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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":{"dateUpdated":"2026-08-21T09:52:44.178Z","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","shortName":"EEF"},"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"}},"cveMetadata":{"assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","assignerShortName":"EEF","cveId":"CVE-2026-47079","datePublished":"2026-08-21T09:52:44.178Z","dateReserved":"2026-05-18T17:28:10.319Z","dateUpdated":"2026-08-21T12:19:47.179Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-21 10:16:38","lastModifiedDate":"2026-08-24 16:47:56","problem_types":["CWE-838","CWE-838 CWE-838 Inappropriate Encoding for Output Context"],"metrics":{"cvssMetricV40":[{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","type":"Secondary","cvssData":{"version":"4.0","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","baseScore":2.1,"baseSeverity":"LOW","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-21T12:17:52.012230Z","id":"CVE-2026-47079","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"47079","Ordinal":"1","Title":"Round-trip Corruption via Improper Entity Escaping in xml_builde","CVE":"CVE-2026-47079","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"47079","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Round-trip Corruption via Improper Entity Escaping in xml_builde"}]}}}