CVE-2026-7422

Medium

Description

Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the device's own registered endpoints, because the loopback detection mechanism skips all input validation for packets whose source MAC matches a local endpoint. To mitigate this issue, users should upgrade to the fixed version when available.

SeverityMedium

CVSS6.5

Exploit probability—

ProductAmazon Freertos-plus-tcp

PublishedApr 29, 2026

First seenApr 29, 2026

Weakness typeCWE-290CWE-290

How to fix

Update

amazon freertos-plus-tcp4.2.6, 4.4.1 or later

Patches

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-021-aws/

Affected products

Product	Affected versions	Fixed in
amazon freertos-plus-tcp	4.0.0 ≤ v < 4.2.6, 4.3.0 ≤ v < 4.4.1	4.2.6, 4.4.1

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