CVE-2026-61387 Eclipse CVE debrief

Who should care

Users of Eclipse Milo versions 1.0.0 through 1.1.4, administrators of affected systems, security teams monitoring for potential quota exhaustion attacks, and operators responsible for maintaining system uptime and availability should be aware of this vulnerability. They should assess their exposure, review vendor guidance, and implement compensating controls as needed to mitigate potential impacts on system performance and security posture. Vulnerability management teams should prioritize patching or mitigating this issue to prevent potential denial-of-service conditions. Security teams should also monitor for suspicious CreateMonitoredItems events that could indicate attempted exploitation. Asset owners and platform administrators must collaborate to ensure timely remediation and minimize potential downtime or security risks. This requires coordination with IT operations, security, and development teams to ensure comprehensive coverage and minimize potential attack surfaces. Regular review of system configurations, monitoring of system logs, and implementation of additional security controls can help mitigate the risks associated with this vulnerability. By taking proactive measures, organizations can reduce the likelihood of successful exploitation and minimize potential impacts on their systems and data. Effective communication and collaboration among stakeholders are crucial to ensuring the timely and effective remediation of this vulnerability. This includes providing clear guidance on affected systems, recommended actions, and expected outcomes to stakeholders, as well as monitoring and reporting on remediation progress and effectiveness. By working together, organizations can minimize the risks associated with this vulnerability and maintain the security and integrity of their systems and data. The CVE record provides a starting point for understanding the vulnerability, but additional research and analysis may be necessary to fully understand the implications and develop effective mitigation strategies. This may involve reviewing vendor documentation, consulting with security experts, and conducting thorough risk assessments to identify potential attack,

Technical summary

Eclipse Milo 1.0.0 through 1.1.4 has an issue with monitored-item quota accounting not being exception-safe. A deeply nested PubSub ExtensionObjects in a CreateMonitoredItems event filter can trigger a StackOverflowError, allowing an unauthenticated remote client to exhaust the global monitored-item quota. This issue can prevent all clients from creating new monitored items until the server is restarted. Existing monitored items and other server functions remain unaffected during exploitation.

Defensive priority

CVE-2026-61387 is rated MEDIUM with a CVSS score of 6.9. Unaffected server functions and existing monitored items remain operational during exploitation. Implement compensating controls and monitor for suspicious CreateMonitoredItems events.

Recommended defensive actions

• Inventory vulnerable Eclipse Milo versions 1.0.0 through 1.1.4
• Apply patches from reference commits
• Monitor CreateMonitoredItems events for suspicious activity
• Implement compensating controls to limit quota exhaustion
• Review system configurations and monitoring of system logs
• Collaborate with IT operations, security, and development teams for comprehensive coverage
• Provide clear guidance on affected systems, recommended actions, and expected outcomes to stakeholders

Evidence notes

Evidence is based on official CVE and NVD records, and Eclipse Milo project references. Limited detail is available on potential exploits or affected user scope beyond version 1.0.0 through 1.1.4. Verify inventory for vulnerable Milo versions. Additional evidence review is required to understand the full scope of affected systems and potential attack vectors.

Official resources