CVE-2026-7422

medium

Published 2026-04-29 · Modified 2026-05-04

CVSS v3

6.5

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v2

—

VIR risk

6.5

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.

Predictions

Exploit likelihood

65%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: ff89ba41-3aa1-4d27-914a-91399e9639e5 — https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9

vendor Authored 2026-05-27

Vendor advisory: ff89ba41-3aa1-4d27-914a-91399e9639e5 — https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1

vendor Authored 2026-05-27

Vendor advisory: ff89ba41-3aa1-4d27-914a-91399e9639e5 — https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6

vendor Authored 2026-05-27

Vendor advisory: ff89ba41-3aa1-4d27-914a-91399e9639e5 — https://aws.amazon.com/security/security-bulletins/2026-021-aws/

Application impact

Vendor	Product	Versions	Fixed
amazon	freertos-plus-tcp	`{"startIncluding":"4.0.0","endExcluding":"4.2.6"}`	`4.2.6`

References

CWEs

CWE-290

Verify integrity in audit chain (admin only). AS-IS.