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

> CVE-2026-92943: Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python. CVSS 8.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-92943
Last updated: 2026-09-18T17:48:19Z

- Published: 2026-09-17 19:14 UTC · Updated: 2026-09-18 17:48 UTC · Assigner: AMZN
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.38%, 32th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- AWS: AWSIoTPythonSDK

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-92943)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-92943)
- [https://aws.amazon.com/security/security-bulletins/2026-114-aws/](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/releases/tag/v1.6.1)
- [https://github.com/aws/aws-iot-device-sdk-python/security/advisories/GHSA-g7vp-3rxx-v25r](https://github.com/aws/aws-iot-device-sdk-python/security/advisories/GHSA-g7vp-3rxx-v25r)
- [https://pypi.org/project/AWSIoTPythonSDK/1.6.1/](https://pypi.org/project/AWSIoTPythonSDK/1.6.1/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-92943 · Markdown: https://rewindex.com/cve/CVE-2026-92943.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-92943 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:05.009Z