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CVE-2026-92943

Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python

CVSS 3.1 8.1 HIGHCVSS 4.0 9.2 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-92943

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-92943

Published

AWSIoTPythonSDK

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "AWS",
                    "product": "AWSIoTPythonSDK",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "1.5.3",
                            "lessThanOrEqual": "1.6.0",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON