PT-2026-35973 · Aws · Freertos-Plus-Tcp

Eun0Us · Published 2026-04-29 · Updated 2026-05-04 · CVE-2026-7422

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions FreeRTOS-Plus-TCP versions prior to 4.2.6 FreeRTOS-Plus-TCP versions prior to 4.4.1

Description Insufficient packet validation allows an adjacent network actor to bypass checksum and minimum-size validation. This occurs because the loopback detection mechanism skips all input validation for packets where the Ethernet source MAC address is spoofed to match one of the device's own registered endpoints.

Recommendations Upgrade to version 4.2.6 or later. Upgrade to version 4.4.1 or later.

Fix

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-290

Related Identifiers

CVE-2026-7422

Affected Products

Freertos-Plus-Tcp

References · 7

• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 · Patch
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 · Patch
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9 · Patch
• https://aws.amazon.com/security/security-bulletins/2026-021-aws · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-7422 · Security Note
• https://t.me/cveNotify/162024 · Telegram Post
• https://twitter.com/CVEnew/status/2049578373467545613 · Twitter Post