AWS IoT Device SDK Python TLS Hostname Mismatch CVE-2026-92943 (1.5.3-1.6.0)
CVE-2026-92943 Published on September 17, 2026
Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python
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.
Vulnerability Analysis
CVE-2026-92943 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Improper Validation of Certificate with Host Mismatch
The software communicates with a host that provides a certificate, but the software does not properly ensure that the certificate is actually associated with that host.
Products Associated with CVE-2026-92943
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Affected Versions
AWSIoTPythonSDK:- Version 1.5.3, <= 1.6.0 is affected.