Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| joshnuss | xml_builder | 0.0.7 – < 2.4.1 | 2.4.1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Hex | xml_builder | >= 0.0.7, < 2.4.1 | 2.4.1 | EEF-CVE-2026-47080 |
References
- https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595 vendor-advisory related
- https://cna.erlef.org/cves/CVE-2026-47080.html related
- https://osv.dev/vulnerability/EEF-CVE-2026-47080 related
- https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706 patch