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

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

Positive Technologies (AI Summary)

CVSS v4.0

7.1

High

Base vector

AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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.

Exploit

Fix

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-290

Related Identifiers

CVE-2026-7422

GHSA-JPW4-6H59-62W9

Affected Products

Freertos-Plus-Tcp

References · 10

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7422.json · Exploit
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 · Patch
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9 · Patch
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 · Patch
• https://osv.dev/vulnerability/CVE-2026-7422 · Vendor Advisory
• https://aws.amazon.com/security/security-bulletins/2026-021-aws · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-7422 · Security Note
• https://github.com/FreeRTOS/FreeRTOS-Plus-TCP · Note
• https://t.me/cveNotify/162024 · Telegram Post
• https://twitter.com/CVEnew/status/2049578373467545613 · Twitter Post