CVE-2026-102552

Medium

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.

SeverityMedium

CVSS5.9

Exploit probability—

ProductFreeRTOS-Plus-TCP

PublishedOct 16, 2026

First seenOct 16, 2026

Weakness typeCWE-940CWE-940

How to fix

Patches

github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-139-aws/

Affected products

Product	Affected versions	Fixed in
FreeRTOS FreeRTOS-Plus-TCP	v ≤ 4.4.1	—

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