CVE-2026-48590: Joshnuss XML Builder

Low severity, CVSS 2.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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.element/1, XmlBuilder.element/2, XmlBuilder.element/3. Element names, attribute names, and doctype identifiers are interpolated verbatim into the serialized XML output without validation or escaping of structural characters (<, >, ", ', &). An attacker who can influence a name argument (for example, an element name derived from a JSON object key or an HTTP form field name) can inject arbitrary XML markup including extra elements, comments, and event-handler attributes into the output document. This issue affects xml_builder: from 0.0.1 before 2.4.1.

Affected products

• Joshnuss XML Builder: from 0.0.1, before 2.4.1 (fixed in 2.4.1)

Published 2026-08-21. Last modified 2026-08-24.