CVE-2026-7422
Published:April 29, 2026
Updated:May 18, 2026
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.
Affected Packages
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP.git (GITHUB):
Affected version(s) >=V2.2.2 <V4.2.6Fix Suggestion:
Update to version V4.2.6https://github.com/FreeRTOS/FreeRTOS-Plus-TCP.git (GITHUB):
Affected version(s) =V4.4.0 <V4.4.1Fix Suggestion:
Update to version V4.4.1Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing
EPSS
Base Score:
0.03