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




  To remediate this issue, users shou…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-789
vendor: AWS
product: aws-c-mqtt
affected:
  - aws-c-mqtt >= 0.9.1 < 0.16.2
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T20:34:50.961Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115417'
references:
  - url: 'https://github.com/awslabs/aws-c-mqtt/releases/tag/v0.16.2'
  - url: >-
      https://github.com/awslabs/aws-c-mqtt/security/advisories/GHSA-g3x5-86mr-65p5
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-147-aws/'
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.419Z'
---

## Overview

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

- `aws-c-mqtt >= 0.9.1 < 0.16.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.