CVE-2026-83615 xmldom CVE debrief

Who should care

Organizations using xmldom in their applications should be aware of this vulnerability and take immediate action to mitigate the risk. This includes assessing their exposure, applying patches or updates, and implementing compensating controls. Operators, platform administrators, vulnerability management teams, and security teams should review the vulnerability details and take necessary actions to protect their systems and data.

Technical summary

The xmldom module, a pure JavaScript W3C standard-based DOMParser and XMLSerializer, has a vulnerability that can lead to quadratic peak namespace-map storage. This can cause heap exhaustion when processing small, highly compressible XML documents. The vulnerability is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12. Organizations should assess their exposure and apply mitigations. The vulnerability affects xmldom versions 0.1.5 through 0.6.0 and @xmldom/xmldom versions prior to 0.8.15 and 0.9.12.

Defensive priority

High-priority defensive actions are required due to the HIGH CVSS score of 8.7. Organizations should rapidly assess their exposure and apply mitigations.

Recommended defensive actions

• Inventory and assess xmldom usage in your applications
• Apply patches or updates to xmldom versions 0.8.15 and 0.9.12 or later
• Implement compensating controls, such as input validation and content security policies
• Monitor for potential exploitation attempts
• Review and update your organization's vulnerability management processes

Evidence notes

The vulnerability in xmldom, a pure JavaScript W3C standard-based DOMParser and XMLSerializer module, is related to quadratic peak namespace-map storage. This can lead to heap exhaustion when processing small, highly compressible XML documents. Evidence from the NVD and CVE Program indicates that the vulnerability is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12. However, no fixed version is available for xmldom. Defenders should verify the affected scope, apply patches or updates, and implement compensating controls.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.