What’s Vulnerable › Vulnerabilities

CVE-2026-115417: Memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter in aws-c-mqtt

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-22 · updated 2026-10-29
• Weakness: CWE-789

Description

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. To remediate this issue, users should upgrade to aws-c-mqtt 0.16.2 or later, or to an AWS Common Runtime or AWS IoT Device SDK release that bundles it.

Affected products

• aws-c-mqtt: from 0.9.1 before 0.16.2 — fixed in 0.16.2

How to fix

Upgrade to a fixed version: aws-c-mqtt 0.16.2. Check the vendor advisory for mitigations.

References

• https://aws.amazon.com/security/security-bulletins/2026-147-aws/
• https://github.com/awslabs/aws-c-mqtt/releases/tag/v0.16.2
• https://github.com/awslabs/aws-c-mqtt/security/advisories/GHSA-g3x5-86mr-65p5

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