CVE-2026-111924 FleetDM CVE debrief

Who should care

Defenders responsible for Fleet instances should assess exposure and prioritize verification and mitigation efforts to prevent potential memory exhaustion attacks. This includes verifying Fleet instances for version 4.83.0 or later and implementing compensating controls. Additionally, defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates

Why it matters

CVE-2026-111924 is a denial of service vulnerability in Fleet before 4.83.0 that allows unauthenticated attackers to exhaust server memory. Defenders should prioritize verifying Fleet instances and implementing compensating controls.

• Potential memory exhaustion and server crashes
• Need to verify Fleet instances for version 4.83.0 or later
• Possible impact on service availability

Technical summary

The vulnerability allows unauthenticated attackers to exhaust server memory by sending gzip-compressed request bodies to unauthenticated endpoints, causing the entire Fleet instance to crash. This denial of service vulnerability affects Fleet before version 4.83.0. The vulnerability is caused by the server's inability to handle highly compressed requests, which can lead to a denial of service. Defenders should prioritize verifying Fleet instances for version 4.83.0 or later and implementing compensating controls to mitigate potential memory exhaustion attacks.

Defensive priority

Defenders should prioritize verifying Fleet instances for version 4.83.0 or later and implementing compensating controls to mitigate potential memory exhaustion attacks.

Recommended defensive actions

• Verify Fleet instances for version 4.83.0 or later
• Implement compensating controls to mitigate potential memory exhaustion attacks
• Monitor Fleet instances for unusual memory usage patterns
• 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
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected deployments and remediation efforts is limited. Defenders should verify Fleet instances for version 4.83.0 or later and implement compensating controls to mitigate potential memory exhaustion attacks. The vulnerability allows unauthenticated attackers to exhaust server memory by sending gzip-compressed request bodies to unauthenticated endpoints, causing the entire Fleet instance to crash. There is limited information available on

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.