AWS Identifies Memory Flaw in MQTT Library
A newly discovered vulnerability in the aws-c-mqtt library could allow remote attackers to cause a denial of service.
Updated on Oct. 23, 2026 in Cybersecurity
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Amazon Web Services has disclosed a memory allocation vulnerability, tracked as CVE-2026-115417, affecting its aws-c-mqtt library. The flaw could enable a remote actor to trigger a denial of service by forcing the system to allocate memory with an excessive size.
Why it matters
The vulnerability affects critical components within the AWS Common Runtime and AWS IoT Device SDK for C++, potentially impacting devices that rely on these tools for secure MQTT 3.1.1 communication.
The flaw is categorized as CWE-789, involving memory allocation with an excessive size value. It specifically impacts the MQTT 3.1.1 compatibility adapter used in versions 0.9.1 through 0.16.2 of the library.
The players
Amazon Web Services
Amazon Web Services is a comprehensive cloud computing platform that provides a wide range of services to developers and enterprises.
The details
The issue stems from how the library handles memory requests, creating a pathway for a denial of service if an actor pushes an oversized allocation. This affects the AWS Common Runtime and the AWS IoT Device SDK for C++ v2.
Timeline
The AWS security bulletin regarding the vulnerability was published on October 23, 2026.
The Tech Race
This vulnerability disclosure follows the protocol set by the Common Vulnerabilities and Exposures (CVE) identification system for tracking critical software flaws. It marks a necessary maintenance step for the AWS IoT ecosystem as it moves to patch memory handling issues in legacy library versions.
Developers and system administrators using the affected library versions should prioritize updating their software to mitigate potential denial-of-service risks. Failure to apply these updates may leave IoT infrastructure vulnerable to remote exploitation.
The takeaway
Maintaining up-to-date SDK versions is essential for protecting connected devices against memory-based attacks. Organizations should regularly audit their library dependencies to ensure they remain outside the identified vulnerable version range.
Further reading
For more information on current software threats and patches, visit the Cybersecurity section.
Source note: This article includes information reported by IT Security News - cybersecurity, infosecurity news.
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