CVE-2026-92943

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

Published Sep 17, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python
First Time appeared Aws
Aws awsiotpythonsdk
Weaknesses CWE-297
CPEs cpe:2.3:a:aws:awsiotpythonsdk:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws awsiotpythonsdk
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Sep 17, 2026, 7:57 PM
Reserved
Sep 17, 2026, 12:43 PM
Status
Awaiting Analysis
Published
Sep 17, 2026, 8:18 PM
Modified
Sep 18, 2026, 5:48 PM