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CVE-2026-47080— CDATA Section Breakout via Unsanitised ]]> in xml_builder

Quick assessment

Affected
joshnuss xml_builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joshnuss xml_builder（XmlBuilder 模块）中存在 XML 注入漏洞，可导致内容伪造（Content Spoofing）和 XML 注入。 该漏洞与程序文件 以及程序例程 、 和 相关。 在 中，针对 的 函数将数据直接拼接在 CDATA 开始标记 和结束标记 之间，未对嵌入的 序列进行重写或分割处理。由于 CDATA 部分内部没有转义机制，因此嵌入任意字节的安全唯一方法是在 处进行分割，并生成相邻的 CDATA 部分。如果攻击者提供的输入中包含 ，则会提前关闭 CDATA 部分；后续的任

CVSS 2.1 · Low EPSS 0.17% · P6

Affected Version Matrix 2

VendorProduct Version RangeStatus
joshnuss xml_builder 0.0.7< 2.4.1 affected
26766f884ed19adee1563522c7afb5f056a6f3b5< bfb1ada071ccc1e384c30f782197ca5154106706 affected
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I. Basic Information for CVE-2026-47080

Vulnerability Information
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Vulnerability Title
CDATA Section Breakout via Unsanitised ]]> in xml_builder
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML注入(XPath盲注)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
joshnuss xml_builder 0.0.7 ~ 2.4.1 cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*
joshnuss xml_builder 26766f884ed19adee1563522c7afb5f056a6f3b5 ~ bfb1ada071ccc1e384c30f782197ca5154106706 cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-47080

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III. Intelligence Information for CVE-2026-47080

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Patches & Fixes for CVE-2026-47080 (1)

Vendor Advisories for CVE-2026-47080 (2)

News Coverage for CVE-2026-47080 (1)

Same Patch Batch · joshnuss · 2026-08-21 · 3 CVEs total

CVE-2026-47079 2.1 LOW Round-trip Corruption via Improper Entity Escaping in xml_builder
CVE-2026-48590 2.1 LOW Element and Attribute Names Injected Verbatim into XML Output in xml_builder

IV. Related Vulnerabilities

Same product: xml_builder
Same vendor: joshnuss
Same weakness: CWE-91

V. Comments for CVE-2026-47080

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