Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
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-3
- https://pypi.org/project/AWSIoTPythonSDK/1.6.1/
FAQ
What is CVE-2026-92943?
CVE-2026-92943 is a vulnerability with a CVSS score of 8.1 (HIGH). 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-t...
How severe is CVE-2026-92943?
CVE-2026-92943 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-92943?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.