CDATA Section Breakout via Unsanitised ]]> in xml_builder (CVE-2026-47080) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-47080

CDATA Section Breakout via Unsanitised ]]> in xml_builder

Answer in brief

CVE-2026-47080 records a Unknown severity vulnerability in CDATA Section Breakout via Unsanitised ]]> in xml_builder. The current sources do not mark it as known exploited. The current feed maps joshnuss/xml_builder (generic), joshnuss/xml_builder (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 21, 2026Updated Aug 21, 2026Source checked Aug 21, 2026First seen by HOL Aug 21, 2026Material review Aug 21, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps joshnuss/xml_builder (generic), joshnuss/xml_builder (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
joshnuss/xml_buildergeneric	>=0.0.7 <2.4.1	2.4.1
joshnuss/xml_buildergeneric	>=26766f884ed19adee1563522c7afb5f056a6f3b5 <bfb1ada071ccc1e384c30f782197ca5154106706	bfb1ada071ccc1e384c30f782197ca5154106706

Recommended response

Check inventory. Check lockfiles and deployed manifests for joshnuss/xml_builder, joshnuss/xml_builder.
Review the reported fix. Update joshnuss/xml_builder to 2.4.1; joshnuss/xml_builder to bfb1ada071ccc1e384c30f782197ca5154106706 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 21, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.