CVE-2026-115417

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductAws-c-mqtt

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-789CWE-789

How to fix

Update

AWS aws-c-mqtt0.16.2 or later

Patches

github.com/awslabs/aws-c-mqtt/releases/tag/v0.16.2

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-147-aws/

Affected products

Product	Affected versions	Fixed in
AWS aws-c-mqtt	0.9.1 ≤ v < 0.16.2	0.16.2

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