CRITICAL 9.2 NVD
CVE-2026-92943
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
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.
References
- https://aws.amazon.com/security/security-bulletins/2026-114-aws/
- https://github.com/aws/aws-iot-device-sdk-python/releases/tag/v1.6.1
- https://github.com/aws/aws-iot-device-sdk-python/security/advisories/GHSA-g7vp-3rxx-v25r
- https://pypi.org/project/AWSIoTPythonSDK/1.6.1/
This critical severity vulnerability with a CVSS score of 9.2 was published on 2026-09-17 via NVD.
Risk Timeline
CVE Disclosed2026-09-17 · -1 days ago
Remediation Resources
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