joshnuss XmlBuilder up to 2.4.0 lib/xml_builder.ex XmlBuilder.escape data xml injection

Summaryinfo

A vulnerability was found in joshnuss XmlBuilder up to 2.4.0. It has been declared as critical. This vulnerability affects the function XmlBuilder.escape of the file lib/xml_builder.ex. Executing a manipulation of the argument data can lead to xml injection. This vulnerability appears as CVE-2026-47080. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in joshnuss XmlBuilder up to 2.4.0 and classified as critical. This vulnerability affects the function XmlBuilder.escape of the file lib/xml_builder.ex. The manipulation of the argument data with an unknown input leads to a xml injection vulnerability. The CWE definition for the vulnerability is CWE-91. The product does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.escape/1. The escape/1 clause for {:cdata, data} in lib/xml_builder.ex concatenates data verbatim between the CDATA opener <![CDATA[ and closer ]]> without rewriting or splitting on the embedded ]]> sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]> and emit adjacent CDATA sections. An attacker who can supply input containing ]]> closes the CDATA section early; any bytes that follow are parsed as ordinary XML markup by downstream consumers, allowing injection of arbitrary elements, text, or entity references into the output document. This issue affects xml_builder: from 0.0.7 before 2.4.1.

The advisory is available at github.com. This vulnerability was named CVE-2026-47080 since 05/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1505 by the MITRE ATT&CK project.

Upgrading to version 2.4.1 eliminates this vulnerability.

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Productinfo

Vendor

• joshnuss

Name

• XmlBuilder

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4.0

CPE 2.3info

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CPE 2.2info

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