CVE-2026-92943
Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python
- State
- Published
- Severity
- 9.2 Critical
- Published
- Sep 17, 2026
- Updated
- Sep 17, 2026
- Reserved
- Sep 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | AMZN |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | AMZN |
Weaknesses
- CWE-297 Improper validation of certificate with host mismatch
Affected Products
| Product | Versions |
|---|---|
AWSIoTPythonSDKAWS |
|
References
- https://pypi.org/project/AWSIoTPythonSDK/1.6.1/patchrelease-notes
- https://github.com/aws/aws-iot-device-sdk-python/releases/tag/v1.6.1patchrelease-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-v25rrelease-notes
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