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

> CVE-2026-115417: Memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter in aws-c-mqtt. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-115417
Last updated: 2026-10-23T17:17:17Z

- Published: 2026-10-22 20:34 UTC · Updated: 2026-10-23 17:17 UTC · Assigner: AMZN
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.35%, 28th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- AWS: aws-c-mqtt

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-115417)
- [NVD entry](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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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-115417 · Markdown: https://rewindex.com/cve/CVE-2026-115417.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-115417 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:34.707Z