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CVE-2026-92943— Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python

Quick assessment

Affected
AWS AWSIoTPythonSDK
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AWS IoT Python 设备 SDK（版本 1.5.3 至 1.6.0）在 Python 3.7 及更高版本上的 MQTT 客户端 TLS 连接层中，存在证书验证不当的问题（具体表现为主机名不匹配未被正确校验）。此漏洞可能被中间人攻击者利用，通过一个由设备信任存储区中证书颁发机构（CA）签发的、指向无关主机名的证书，冒充 AWS IoT Core 端点，从而窃听设备遥测数据，并向设备注入任意 MQTT 消息，使设备误认为这些消息是合法可信的。 要修复此问题，用户应升级至版本 1.6.1。

CVSS 8.1 · High EPSS 0.27% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS AWSIoTPythonSDK 1.5.3≤ 1.6.0 affected
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I. Basic Information for CVE-2026-92943

Vulnerability Information
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Vulnerability Title
Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS AWSIoTPythonSDK 1.5.3 ~ 1.6.0 -

II. Public POCs for CVE-2026-92943

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-92943

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Vendor Advisories for CVE-2026-92943 (1)

Vendor Pages for CVE-2026-92943 (2)

IV. Related Vulnerabilities

Same vendor: AWS
Same weakness: CWE-297

V. Comments for CVE-2026-92943

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