CVE-2026-92943High· 8.1▾ Twilight

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 AW…

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score45/ 100 · Moderate

impact 44.6 · likelihood 0.1 · exploitation 0

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

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Published

Sep 17, 2026

Updated

Sep 18, 2026

CVSS

8.1

Vendor

AWS

Product

AWSIoTPythonSDK

CWE

CWE-297

Depth score

45 · Moderate

EPSS

0.38% · p32

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

decided 2026-09-17

Exploitation: none
Automatable: no
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Sep 18.

0.3% → 0.4%▲ 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 8 days

Sep 17, 2026Published
Disclosed via NVD
Sep 18, 2026Record revised
Last analysed / modified upstream
Sep 18, 2026EPSS first tracked
0.3%
Sep 25, 2026EPSS peak
0.3% → 0.4%

AWS CWE-297 #nvd #cve.org

Affected

AWSIoTPythonSDK >= 1.5.3 <= 1.6.0

Full technical detail▾

Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org

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