CVE-2026-92943 Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python
An attacker can impersonate AWS IoT endpoints to read telemetry and inject messages due to improper TLS certificate host validation in the Python SDK.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-92943?
CVE-2026-92943 is a critical vulnerability in AWSIoTPythonSDK, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-297
Which versions are affected by CVE-2026-92943?
How do I fix CVE-2026-92943?
No fix has been published for CVE-2026-92943 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-92943 being exploited?
There is no known exploitation of CVE-2026-92943 in the wild and no public exploit code.
Sources
Also known as GHSA-g7vp-3rxx-v25r.