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

Quick assessment

Affected
AWS aws-c-mqtt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 AWS aws-c-mqtt 0.16.2 之前的版本中，MQTT 3.1.1 兼容性适配器存在因分配过大内存而引发的漏洞，可能允许远程攻击者导致客户端应用程序发生拒绝服务（DoS）。 为修复此问题，用户应升级至 aws-c-mqtt 0.16.2 或更高版本，或升级至包含该版本的 AWS 通用运行时（AWS Common Runtime）或 AWS IoT 设备 SDK 的发布版本。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-115417

Vulnerability Information
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Vulnerability Title
Memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter in aws-c-mqtt
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS aws-c-mqtt 0.9.1 ~ 0.16.2 -

II. Public POCs for CVE-2026-115417

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III. Intelligence Information for CVE-2026-115417

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Other References for CVE-2026-115417 (3)

Same Patch Batch · AWS · 2026-10-22 · 4 CVEs total

CVE-2026-115419 8.1 HIGH Unintended disclosure of data element to wrong session in Strands Agents SDK A2A Server
CVE-2026-115414 7.8 HIGH OS command injection in the Terraform hook in AWS SAM CLI
CVE-2026-115416 7.7 HIGH Incorrect authorization checks in Amazon Athena engine version 3 query processing

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-789

V. Comments for CVE-2026-115417

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