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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0035.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
AWS aws-c-mqtt unaffected
Version Status Constraints
0.9.1 affected < 0.16.2

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No data.

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Project Subscriptions

Vendors Products
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Aws-c-mqtt Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://aws.amazon.com/security/security-bulletins/2026-147-aws/ cve-icon cve-icon
https://github.com/awslabs/aws-c-mqtt/releases/tag/v0.16.2 cve-icon cve-icon
https://github.com/awslabs/aws-c-mqtt/security/advisories/GHSA-g3x5-86mr-65p5 cve-icon cve-icon
History

Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
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.
Title Memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter in aws-c-mqtt
First Time appeared Aws
Aws aws-c-mqtt
Weaknesses CWE-789
CPEs cpe:2.3:a:aws:aws-c-mqtt:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws aws-c-mqtt
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-10-22T20:34:50.961Z

Reserved: 2026-10-22T13:18:17.258Z

Link: CVE-2026-115417

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-22T21:17:17.633

Modified: 2026-10-22T21:17:17.633

Link: CVE-2026-115417

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T03:30:15Z

Weaknesses