Vulnerability · Published Sep 17, 2026 · Assigned by AMZN
CVE-2026-92943Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python
High 8.1
In plain English
A high-severity security flaw in AWSIoTPythonSDK from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).
Official description
Improper validation of certificate with host mismatch in the MQTT client TLS connection layer in AWS IoT Device SDK for Python 1.5.3 through 1.6.0 on Python 3.7 and later might allow an adversary-in-the-middle actor to impersonate the AWS IoT Core endpoint, read device telemetry, and inject arbitrary MQTT messages that the device processes as authentic, via a certificate issued for an unrelated hostname by a certificate authority present in the device trust store. To remediate this issue, users should upgrade to version 1.6.1.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AWS | AWSIoTPythonSDK | 1.5.3 – through 1.6.0 |
Weakness: CWE-297 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://pypi.org/project/AWSIoTPythonSDK/1.6.1/ patch, release-notes
- https://github.com/aws/aws-iot-device-sdk-python/releases/tag/v1.6.1 patch, release-notes
- https://aws.amazon.com/security/security-bulletins/2026-114-aws/ vendor-advisory
- https://github.com/aws/aws-iot-device-sdk-python/security/advisories/GHSA-g7vp-3rxx-v25r release-notes