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CVE-2026-48590— Element and Attribute Names Injected Verbatim into XML Output 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.

漏洞描述： joshnuss 开发的 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 及相关函数 、 、 、 、 有关。 元素名称、属性名称以及文档类型（DOCTYPE）标识符在未进行任何验证或转义处理的情况下，被直接拼接（verbatim interpolation）到序列化的 XML 输出中。这意味着结构字符 、 、 、 、 未被正确处理。攻击者若能操控某个名称参数（例如，源自 JSON 对象键

CVSS 2.1 · Low EPSS 0.17% · P6

Affected Version Matrix 2

VendorProduct Version RangeStatus
joshnuss xml_builder 0.0.1< 2.4.1 affected
9fb49131ad3ee146a4c9db9bc175bdffe32e30a0< d5c0aec32a8eecbb440fb9bbb0f59d4d188d5859 affected
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I. Basic Information for CVE-2026-48590

Vulnerability Information
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Vulnerability Title
Element and Attribute Names Injected Verbatim into XML Output 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.element/1, XmlBuilder.element/2, XmlBuilder.element/3. Element names, attribute names, and doctype identifiers are interpolated verbatim into the serialized XML output without validation or escaping of structural characters (<, >, ", ', &). An attacker who can influence a name argument (for example, an element name derived from a JSON object key or an HTTP form field name) can inject arbitrary XML markup including extra elements, comments, and event-handler attributes into the output document. This issue affects xml_builder: from 0.0.1 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 0.0.1 ~ 2.4.1 cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*
joshnuss xml_builder 9fb49131ad3ee146a4c9db9bc175bdffe32e30a0 ~ d5c0aec32a8eecbb440fb9bbb0f59d4d188d5859 cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-48590

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III. Intelligence Information for CVE-2026-48590

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Patches & Fixes for CVE-2026-48590 (1)

Vendor Advisories for CVE-2026-48590 (2)

News Coverage for CVE-2026-48590 (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-2026-47080 2.1 LOW CDATA Section Breakout via Unsanitised ]]> in xml_builder

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-48590

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