CVE-2026-115417 AWS CVE debrief

Who should care

Defenders of systems using aws-c-mqtt before 0.16.2 should assess exposure and prioritize upgrading to a fixed version. This includes operators, platform administrators, vulnerability management teams, and security teams. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Why it matters

Defenders of systems using aws-c-mqtt before 0.16.2 should assess exposure and prioritize upgrading to a fixed version to prevent potential denial of service.

• Potential denial of service of the client application
• Need to verify affected versions and upgrade to a fixed version

Technical summary

Memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter in AWS aws-c-mqtt before 0.16.2 might allow a remote actor to cause a denial of service of the client application. The issue affects systems using aws-c-mqtt before 0.16.2, and defenders should assess exposure and prioritize upgrading to a fixed version. The vulnerability is related to memory allocation with excessive size value, which might allow a remote actor to cause a denial of service. The CVE record and source item provide details on the memory allocation issue.

Defensive priority

Upgrade to a fixed version to prevent potential denial of service

Recommended defensive actions

• Upgrade to aws-c-mqtt 0.16.2 or later
• Use an AWS Common Runtime or AWS IoT Device SDK release that bundles the fixed version
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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
• 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

Evidence notes

The CVE record and source item provide details on the memory allocation issue in aws-c-mqtt before 0.16.2. The issue is related to memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter. Defenders should verify affected versions and upgrade to a fixed version. The source item and CVE record provide evidence of the vulnerability, but additional verification is needed to confirm affected scope and severity.

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.