CVE-2026-47079 joshnuss CVE debrief

Who should care

Developers and administrators using xml_builder versions 0.0.6 to 2.4.0 should review and apply vendor remediation. Downstream consumers parsing the produced XML and rendering text content in markup-sensitive contexts should also take precautions to prevent potential Cross-site Scripting attacks. Security teams should monitor for suspicious activity and exception tracking, and implement compensating controls for exposed systems while remediation is scheduled and verified. Vulnerability management teams should prioritize patching affected systems and review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Asset owners should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Platform administrators should check relevant monitoring, detection, and logs for exposed assets that need extra review. Operations teams should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. IT security should track exceptions, retest remediated assets, and close the item only after evidence is documented. This may involve coordinating with developers, administrators, and downstream consumers to ensure comprehensive mitigation and remediation efforts across the organization. The CVE record was published on 2026-08-21T10:16:38.167Z and has not been modified since then, but ongoing review and verification are necessary to ensure the accuracy and completeness of the information provided. Additionally, defenders should be aware of the limited attack surface and low CVSS score, which may impact the prioritization of defensive actions. However, given the potential impact on downstream consumers and the ease of exploitation, proactive measures are warranted to mitigate potential risks. Affected operators should also consider implementing additional security controls, such as input validation and output encoding, to further reduce the risk of exploitation. By taking these precautions, organizations can minimize the potential impact of this vulnerability and protect their systems from potential attacks. Overall, a coordinated and -

Technical summary

The xml_builder module has an Inappropriate Encoding for Output Context vulnerability, allowing Content Spoofing and Cross-site Scripting. The vulnerability affects xml_builder versions from 0.0.6 before 2.4.1. The issue is caused by the XmlBuilder.generate/1 function not escaping literal & characters in text or attribute values when followed by an entity-like token. 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.

Defensive priority

Low-priority defensive review recommended due to limited attack surface and low CVSS score.

Recommended defensive actions

• Review and apply vendor remediation for xml_builder version 2.4.1 or later
• Inventory checks for affected xml_builder versions (0.0.6 to 2.4.0)
• Implement compensating controls, such as input validation and output encoding
• Monitor for suspicious activity and exception tracking
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

Evidence is limited; primary official records indicate an Inappropriate Encoding for Output Context vulnerability in xml_builder, allowing Content Spoofing and Cross-site Scripting. Further review of source references and affected scope is recommended. The CVE record was published on 2026-08-21T10:16:38.167Z and has not been modified since then. However, defenders should verify the affected versions (xml_builder: from 0.0.6 before 2.4.1) and review compensating controls for exposed systems.

Official resources