What’s Vulnerable › Vulnerabilities

CVE-2026-92943: Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-09-18
• Weakness: CWE-297

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

• AWSIoTPythonSDK: from 1.5.3 through 1.6.0

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/

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