CVE-2026-102552

Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP DNS resolver

State: Published
Severity: 8.2 High
Published: Oct 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 29, 2026

Description

Improper verification of the source of a communication channel in the DNS resolver in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow remote third-party to insert a chosen address into the device's DNS cache via a forged DNS reply.

To remediate this issue, users should upgrade to version V4.4.2 and enable ipconfigDNS_CHECK_REPLY_SOURCE_IP.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	AMZN
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N	AMZN

Weaknesses

CWE-940 Improper verification of source of a communication channel

Affected Products

Product	Versions
FreeRTOS-Plus-TCPFreeRTOS	4.4.1 and earlierAffected

References

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-139-aws/vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-h4fw-pv82-p7h5third-party-advisory

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