---
title: "CVE-2026-115417: AWS aws-c-mqtt - Denial of Service"
description: "AWS aws-c-mqtt before 0.16.2 contains a denial of service caused by memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter, letting remote attackers cause client application crash, exploit requires network access."
url: https://panop.io/threat-heartbeat/CVE-2026-115417/
---

# CVE-2026-115417 AWS aws-c-mqtt - Denial of Service

AWS aws-c-mqtt before 0.16.2 contains a denial of service caused by memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter, letting remote attackers cause client application crash, exploit requires network access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-115417)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-789](https://cwe.mitre.org/data/definitions/789.html)

## Vendor fix

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.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-115417](https://nvd.nist.gov/vuln/detail/CVE-2026-115417)
- [https://aws.amazon.com/security/security-bulletins/2026-147-aws/](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/releases/tag/v0.16.2)
- [https://github.com/awslabs/aws-c-mqtt/security/advisories/GHSA-g3x5-86mr-65p5](https://github.com/awslabs/aws-c-mqtt/security/advisories/GHSA-g3x5-86mr-65p5)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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