Element and Attribute Names Injected Verbatim into XML Output in xml_builder (CVE-2026-48590) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-48590

Element and Attribute Names Injected Verbatim into XML Output in xml_builder

Answer in brief

CVE-2026-48590 records a Unknown severity vulnerability in Element and Attribute Names Injected Verbatim into XML Output 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	>=0.0.1 <2.4.1	2.4.1
joshnuss/xml_buildergeneric	>=9fb49131ad3ee146a4c9db9bc175bdffe32e30a0 <d5c0aec32a8eecbb440fb9bbb0f59d4d188d5859	d5c0aec32a8eecbb440fb9bbb0f59d4d188d5859

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 d5c0aec32a8eecbb440fb9bbb0f59d4d188d5859 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.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.

Quoted source text, attributed separately from HOL analysis.