# CVE-2026-48590

## Summary

- **CVE ID:** CVE-2026-48590
- **Severity:** LOW
- **CVSS Score:** 2.1 (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)
- **CWE:** CWE-91
- **Published:** Aug 21, 2026
- **Last Modified:** Aug 21, 2026

## 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.

## Affected Products

- joshnuss — xml_builder (0.0.1)
- joshnuss — xml_builder (9fb49131ad3ee146a4c9db9bc175bdffe32e30a0)

## References

- [CNA](https://github.com/joshnuss/xml_builder/security/advisories/GHSA-r82p-3q2p-728w)
- [CNA](https://cna.erlef.org/cves/CVE-2026-48590.html)
- [CNA](https://osv.dev/vulnerability/EEF-CVE-2026-48590)
- [CNA](https://github.com/joshnuss/xml_builder/commit/d5c0aec32a8eecbb440fb9bbb0f59d4d188d5859)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._