CVE-2026-92943 Amazon Web Services CVE debrief

Who should care

Defenders of AWS IoT Device SDK for Python deployments, particularly those using versions 1.5.3 through 1.6.0, should assess exposure, verify certificate validation, and monitor device telemetry for suspicious activity. They should also review compensating controls and relevant monitoring, detection, and logs for exposed assets.

Why it matters

CVE-2026-92943 allows an adversary-in-the-middle to impersonate the AWS IoT Core endpoint, read device telemetry, and inject MQTT messages. Defenders should upgrade to version 1.6.1, verify certificate validation, and monitor device telemetry.

• Potential impersonation of AWS IoT Core endpoint
• Possible reading of device telemetry
• Potential injection of arbitrary MQTT messages

Technical summary

The AWS IoT Device SDK for Python 1.5.3 through 1.6.0 on Python 3.7 and later does not properly validate certificates with host mismatches in the MQTT client TLS connection layer, potentially allowing 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. This issue might occur due to improper validation of certificate with host mismatch, which defenders should verify and remediate by upgrading to version 1.6.1.

Defensive priority

Upgrade to version 1.6.1 and verify certificate validation.

Recommended defensive actions

• Upgrade to version 1.6.1
• Verify certificate validation in AWS IoT Device SDK for Python
• Monitor device telemetry for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, the scope of affected devices and potential impact require further verification by defenders. They should verify certificate validation, assess exposure, and monitor device telemetry for suspicious activity, given limited information on affected devices and potential impact.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.