This vulnerability is associated with program files lib/xml_builder.ex and program routines XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.escape_string/1, XmlBuilder.escape_entity/1.
XmlBuilder.generate/1 does not escape literal & characters in text or attribute values when they are followed by an entity-like token (lt;, gt;, amp;, quot;, apos;). As a result, attacker-supplied input such as <script> is emitted verbatim into the serialized XML rather than being escaped to &lt;script&gt;. When a downstream XML parser later reads the document, it decodes the entity sequences into the literal characters <script>, promoting inert-looking text into real markup. This allows an attacker to bypass upstream filters that block raw < and > characters, injecting markup into any downstream consumer that parses the produced XML and renders the text content in a markup-sensitive context (HTML, SVG, RSS/Atom feeds). Both element text and attribute values are affected.
This issue affects xml_builder: from 0.0.6 before 2.4.1.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| joshnuss | xml_builder | unaffected |
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| joshnuss | xml_builder | unaffected |
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Solution
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Workaround
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Fri, 21 Aug 2026 10:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Inappropriate Encoding for Output Context vulnerability in joshnuss xml_builder (XmlBuilder module) allows Content Spoofing, Cross-site Scripting. This vulnerability is associated with program files lib/xml_builder.ex and program routines XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.escape_string/1, XmlBuilder.escape_entity/1. XmlBuilder.generate/1 does not escape literal & characters in text or attribute values when they are followed by an entity-like token (lt;, gt;, amp;, quot;, apos;). As a result, attacker-supplied input such as <script> is emitted verbatim into the serialized XML rather than being escaped to &lt;script&gt;. When a downstream XML parser later reads the document, it decodes the entity sequences into the literal characters <script>, promoting inert-looking text into real markup. This allows an attacker to bypass upstream filters that block raw < and > characters, injecting markup into any downstream consumer that parses the produced XML and renders the text content in a markup-sensitive context (HTML, SVG, RSS/Atom feeds). Both element text and attribute values are affected. This issue affects xml_builder: from 0.0.6 before 2.4.1. | |
| Title | Round-trip Corruption via Improper Entity Escaping in xml_builder | |
| First Time appeared |
Joshnuss
Joshnuss xml Builder |
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| Weaknesses | CWE-838 | |
| CPEs | cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Joshnuss
Joshnuss xml Builder |
|
| References |
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| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: EEF
Published:
Updated: 2026-08-21T12:19:47.179Z
Reserved: 2026-05-18T17:28:10.319Z
Link: CVE-2026-47079
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-08-21T10:16:38.167
Modified: 2026-08-21T10:16:38.167
Link: CVE-2026-47079
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-08-21T11:30:04Z