{"id":"CVE-2026-92943","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-92943","generatedAt":"2026-09-20T12:33:48.166Z","title":"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…","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.\n\n\n\nTo remediate this issue, users should upgrade to version 1.6.1.","published":"2026-09-17T20:18:59.000Z","lastModified":"2026-09-18T17:48:19.000Z","status":"Awaiting Analysis","sourceIdentifier":"ff89ba41-3aa1-4d27-914a-91399e9639e5","cvss":{"version":"4.0","score":9.2,"severity":"CRITICAL","vector":"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/M"},"cwe":["CWE-297"],"affected":[],"epss":{"score":0.00273,"percentile":0.19978,"date":"2026-09-19","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-114-aws/","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/aws/aws-iot-device-sdk-python/releases/tag/v1.6.1","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://github.com/aws/aws-iot-device-sdk-python/security/advisories/GHSA-g7vp-3rxx-v25r","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"},{"url":"https://pypi.org/project/AWSIoTPythonSDK/1.6.1/","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-92943","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}