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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AWS | aws-c-mqtt | 0.9.1 – < 0.16.2 | 0.16.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | aws-c-mqtt | 0.16.2-2.1 | openSUSE-SU-2026:12357-1 |
Advisories 1
- openSUSE-SU-2026:12357-1 aws-c-mqtt-bin-0.16.2-2.1 on GA media SUSE / openSUSE Security Updates · Oct 31, 2026
References
- https://github.com/awslabs/aws-c-mqtt/releases/tag/v0.16.2 release-notes patch
- https://github.com/awslabs/aws-c-mqtt/security/advisories/GHSA-g3x5-86mr-65p5 third-party-advisory
- https://aws.amazon.com/security/security-bulletins/2026-147-aws/ vendor-advisory