{"affected":[{"package":{"ecosystem":"Hex","name":"xml_builder","purl":"pkg:hex/xml_builder"},"ranges":[{"events":[{"introduced":"0.0.6"},{"fixed":"2.4.1"}],"type":"SEMVER"}],"versions":["0.0.6","0.0.7","0.0.8","0.0.9","0.1.0","0.1.1","0.1.2","2.0.0","2.1.0","2.1.1","2.1.2","2.1.4","2.2.0","2.3.0","2.4.0"]},{"ranges":[{"events":[{"introduced":"aae31e6e8ac837bcbb8afb816c0d14324b5cfe2b"},{"fixed":"c3390e2046ec297b3bb8c30d5779cdfd6508c275"}],"repo":"https://github.com/joshnuss/xml_builder","type":"GIT"}]}],"aliases":["GHSA-5hjx-8g53-cmvm","CVE-2026-47079"],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Joshua Nussbaum","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"}],"database_specific":{"capec_ids":["CAPEC-120"],"cpe_ids":["cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-838"]},"details":"## Summary\n\nInappropriate 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.","id":"EEF-CVE-2026-47079","modified":"2026-08-21T09:52:44.631222Z","published":"2026-08-21T09:52:44.178Z","references":[{"type":"ADVISORY","url":"https://github.com/joshnuss/xml_builder/security/advisories/GHSA-5hjx-8g53-cmvm"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-47079.html"},{"type":"FIX","url":"https://github.com/joshnuss/xml_builder/commit/c3390e2046ec297b3bb8c30d5779cdfd6508c275"},{"type":"PACKAGE","url":"https://hex.pm/packages/xml_builder"}],"related":[],"schema_version":"1.7.3","severity":[{"score":"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","type":"CVSS_V4"}],"summary":"Round-trip Corruption via Improper Entity Escaping in xml_builder","upstream":[]}