Riskcovery

CVE-2026-47080

CDATA Section Breakout via Unsanitised ]]> in xml_builder

State
Published
Severity
2.1 Low
Published
Aug 21, 2026
Updated
Aug 21, 2026
Reserved
May 18, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
4.02.1 LowCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:NEEF

Weaknesses

  • CWE-91 XML Injection (aka Blind XPath Injection)

Affected Products

ProductVersions
xml_builderjoshnuss
  • 0.0.7 to before 2.4.1Affected
xml_builderjoshnuss
  • 26766f884ed19adee1563522c7afb5f056a6f3b5 to before bfb1ada071ccc1e384c30f782197ca5154106706Affected

References

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