CVE-2026-92943 json
Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python
published 2026-09-17 52 d ago modified 2026-09-18 51 d ago also EUVD-2026-82378
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 52 d ago
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.2 | 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 |
| CNA | 4.0 | 9.2 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- AWS AWSIoTPythonSDK
Classification
- Weakness
-
- CWE-297 Improper Validation of Certificate with Host Mismatch
References
-
pypi.org
/project/AWSIoTPythonSDK/1.6.1/
patch, release-notes
-
github.com
/aws/aws-iot-device-sdk-python/releases/tag/v1.6.1
patch, release-notes
-
aws.amazon.com
/security/security-bulletins/2026-114-aws/
vendor-advisory
-
github.com
/aws/aws-iot-device-sdk-python/security/advisories/GHSA-g7vp-3rxx-v25r
release-notes
Sources
- CVE List CVE-2026-92943
- NVD CVE-2026-92943
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